diff --git a/mods/rgt_towns/rgt_towns_core/init.lua b/mods/rgt_towns/rgt_towns_core/init.lua
index 4eb6672..e0a70f7 100644
--- a/mods/rgt_towns/rgt_towns_core/init.lua
+++ b/mods/rgt_towns/rgt_towns_core/init.lua
@@ -20,10 +20,13 @@ function ns.register_spawner(def)
     ns.spawners[def.plot] = def
 end
 
-function ns.create_spawner(for_plot)
+function ns.create_spawner(for_plot, owner)
     local s = ItemStack("rgt_towns:spawner")
     local m = s:get_meta()
     m:set_string("plot", for_plot)
+    if owner then
+        m:set_string("owner", owner)
+    end
     m:set_string("description", ns.spawners[for_plot].label)
     return s
 end
@@ -37,6 +40,8 @@ end
         thumbnail = "", -- Optional; defines the thumbnail shown in the guide.
         size = <vector>, -- The amount of space taken up by this plot, in grid squares.
         schematic = <schem> or {},
+        ground_level = 5, -- The ground level relative to the bottom of the schematic, used by spawners to determine where to place the schematic relative to the player spawning it.
+        constructors = {n = {5}, w = {5}, s = {5}, e = {5}}, -- The offset from the bottom of the plot at which to place each constructor (to allow for constructors at different Y levels). Defaults to one per horizontally adjoining grid space at y=`ground_level`.
         recipe = { -- 3x3 crafting recipe for this structure, as a flat list of ItemStack strings.
             "stone 60", "wood 10", "stone 60",
             "cobble 25", "diamond 3", "cobble 25",
@@ -69,5 +74,29 @@ function ns.register_plot(def)
         warn "A plot was registered without a name!"
         return
     end
+    if not def.size then
+        def.size = vector.new(1,1,1)
+    end
+    if not def.ground_level then def.ground_level = 5 end
+    for i, x in ipairs(def.recipe) do
+        if x ~= "" and not x:find ":" then
+            def.recipe[i] = "red_glazed_terracotta:"..x
+        end
+    end
+    if def.constructors then
+        local x = def.constructors
+        local out = {}
+    else
+        local out = {}
+        for x = 1, def.size.x do
+            out[#out +1] = vector.new((x -1) *15, def.ground_level,-7)
+            out[#out +1] = vector.new((x -1) *15, def.ground_level, 7)
+        end
+        for y = 1, def.size.z do
+            out[#out +1] = vector.new(-7, def.ground_level, (y -1) *15)
+            out[#out +1] = vector.new( 7, def.ground_level, (y -1) *15)
+        end
+        def.constructors = out
+    end
     ns.plots[def.name] = def
 end
\ No newline at end of file
diff --git a/mods/rgt_towns/rgt_towns_core/items.lua b/mods/rgt_towns/rgt_towns_core/items.lua
index c46461a..95ae85d 100644
--- a/mods/rgt_towns/rgt_towns_core/items.lua
+++ b/mods/rgt_towns/rgt_towns_core/items.lua
@@ -1,5 +1,12 @@
 local ns = rgt_towns
 
+ns.directions = {
+    [0] = vector.new(0,0,1),
+    vector.new(1,0,0),
+    vector.new(0,0,-1),
+    vector.new(-1,0,0)
+}
+
 minetest.register_craftitem(":rgt_towns:spawner", {
     description = "Blank Plot Spawner (you shouldn't have this)",
     stack_max = 1,
@@ -15,17 +22,97 @@ minetest.register_craftitem(":rgt_towns:spawner", {
     on_place = function(s, p, pt)
         local m = s:get_meta()
         local owner = m:get("owner")
-        if owner and owner ~= p:get_player_name() then
+        if not owner then
+            owner = p:get_player_name()
+        elseif owner ~= p:get_player_name() then
             warn("<"..p:get_player_name().."> tried to use <"..owner..">'s '"..(m:get("description") or "Blank Plot Spawner").."' (and failed).")
             return
         end
         local plot = m:get("plot")
         if plot then
-            ns.place_plot(plot, p:get_pos())
+            local def = ns.plots[plot]
+            local pos = p:get_pos():round()
+            pos.y = pos.y -ns.plots[plot].ground_level
+            local q = math.random()
+            ns.create_grid(owner..":town"..q, pos:offset(0,def.size.y *7.5,0))
+            if not ns.place_plot(owner..":town"..q, vector.zero(), plot, owner) then
+                ns.delete_grid(owner..":town"..q)
+            end
         else
             warn("<"..p:get_player_name().."> tried to use an uninitialized plot spawner.")
         end
+        return ItemStack()
     end
 })
 
+--[[
+              +Z
+               ^
+               |
+               |         
+               |
+ -X <----------+----------> +X
+               |
+               |
+               |
+               v
+              -Z
+]]
 
+function ns.check_recipe(inv, plot)
+    local recipe = ns.plots[plot].recipe
+    print(dump(recipe))
+    for i = 1, 9 do
+        print("Evaluating: "..inv:get_stack("main", i):to_string().." vs. "..ItemStack(recipe[i]):to_string())
+        if inv:get_stack("main", i) ~= ItemStack(recipe[i]) then
+            return false
+        end
+    end
+    return true
+end
+
+minetest.register_node(":rgt_towns:constructor", {
+    tiles = {"[fill:16x16:#8af"},
+    on_construct = function(pos)
+        local inv = minetest.get_meta(pos):get_inventory()
+        inv:set_size("main", 9)
+    end,
+    on_rightclick = function(pos, node, p, s)
+        ns.show_constructor_interface(pos, p)
+    end,
+    on_punch = function(pos, node)
+        local m = minetest.get_meta(pos)
+        local grid = m:get_string("grid")
+        local gpos = vector.from_string(m:get_string("build_pos"))
+        local plot = m:get("plot") or "empty_plot"
+        
+        local inv = m:get_inventory()
+        
+        if not ns.check_recipe(inv, plot) then
+            return
+        end
+        
+        ns.place_plot(grid, gpos, plot, tostring(node.param2 *90))
+        
+        minetest.remove_node(pos)
+    end
+})
+
+function ns.show_constructor_interface(pos, p)
+    local name = p:get_player_name()
+    local fs = "\
+        formspec_version[10]\
+        size[12,10]\
+        list[nodemeta:"..pos.x..","..pos.y..","..pos.z..";main;1,1;3.5,3.5]\
+        list[player:"..name..";main;1,5;10,4]\
+        "
+    minetest.show_formspec(name, "constructor:"..pos.x..","..pos.y..","..pos.z, fs)
+end
+
+minetest.register_on_player_receive_fields(function(p, form, data)
+    if form:sub(1, string.len("constructor:")) == "constructor:" then
+        local x, y, z = form:match "constructor:(%d+),(%d+),(%d+)"
+        if not (x and y and z) then return end
+        
+    end
+end)
diff --git a/mods/rgt_towns/rgt_towns_core/plots.lua b/mods/rgt_towns/rgt_towns_core/plots.lua
index c219df0..ae1627b 100644
--- a/mods/rgt_towns/rgt_towns_core/plots.lua
+++ b/mods/rgt_towns/rgt_towns_core/plots.lua
@@ -1,14 +1,288 @@
 local ns = rgt_towns
+local db = minetest.get_mod_storage()
 
-function ns.get_grid()
-    
+ns.grids = minetest.parse_json(db:get("grids") or "{}")
+
+-- Calculates the Euclidean distance squared between two points (avoids sqrt for efficiency)
+local function distance_squared(p1, p2)
+    local dx = p1.x - p2.x
+    local dy = p1.y - p2.y
+    local dz = p1.z - p2.z
+    return dx * dx + dy * dy + dz * dz
 end
 
+-- Returns the point in the AABB farthest from the given point
+-- aabb: table with {min = {x, y, z}, max = {x, y, z}}
+-- point: table with {x, y, z}
+-- Returns: table {x, y, z} representing the farthest corner
+local function get_farthest_point_in_aabb(aabb, point)
+    -- Ensure input validity
+    if not aabb or not aabb.min or not aabb.max or not point then
+        error("Invalid input: aabb or point is missing required fields")
+    end
+
+    -- List all eight corners of the AABB
+    local corners = {
+        {x = aabb.min.x, y = aabb.min.y, z = aabb.min.z},
+        {x = aabb.min.x, y = aabb.min.y, z = aabb.max.z},
+        {x = aabb.min.x, y = aabb.max.y, z = aabb.min.z},
+        {x = aabb.min.x, y = aabb.max.y, z = aabb.max.z},
+        {x = aabb.max.x, y = aabb.min.y, z = aabb.min.z},
+        {x = aabb.max.x, y = aabb.min.y, z = aabb.max.z},
+        {x = aabb.max.x, y = aabb.max.y, z = aabb.min.z},
+        {x = aabb.max.x, y = aabb.max.y, z = aabb.max.z},
+    }
+
+    local max_dist_sq = -1
+    local farthest_point = nil
+
+    -- Iterate through corners to find the one with maximum distance
+    for _, corner in ipairs(corners) do
+        local dist_sq = distance_squared(point, corner)
+        if dist_sq > max_dist_sq then
+            max_dist_sq = dist_sq
+            farthest_point = corner
+        end
+    end
+
+    return farthest_point
+end
+
+function aabb_intersects_sphere(aabb, center, radius)
+    -- Ensure input validity
+    if not aabb or not aabb.min or not aabb.max or not center or not radius or radius < 0 then
+        error("Invalid input: aabb, center, or radius is missing or invalid")
+    end
+
+    -- Find the closest point in the AABB to the sphere's center
+    local closest = {
+        x = math.max(aabb.min.x, math.min(center.x, aabb.max.x)),
+        y = math.max(aabb.min.y, math.min(center.y, aabb.max.y)),
+        z = math.max(aabb.min.z, math.min(center.z, aabb.max.z))
+    }
+
+    -- Check if the closest point is within the sphere's radius
+    local dist_squared = distance_squared(center, closest)
+    return dist_squared <= radius * radius
+end
+
+AABB = setmetatable({
+    intersects = function(a, b, c)
+        if c then
+            return a.min.x < c.x and a.max.x > b.x and
+                   a.min.y < c.y and a.max.y > b.y and
+                   a.min.z < c.z and a.max.z > b.z
+        end
+        return a.min.x < b.max.x and a.max.x > b.min.x and
+               a.min.y < b.max.y and a.max.y > b.min.y and
+               a.min.z < b.max.z and a.max.z > b.min.z
+    end,
+    intersects_2d = function(a, b, c)
+        if c then
+            return a.min.x < c.x and a.max.x > b.x and
+                   a.min.z < c.z and a.max.z > b.z
+        end
+        return a.min.x < b.max.x and a.max.x > b.min.x and
+               a.min.z < b.max.z and a.max.z > b.min.z
+     end
+}, {
+    __call = function(_, min, max)
+        min, max = vector.sort(min, max)
+        return setmetatable({
+            min = min,
+            max = max
+        }, {__index = AABB})
+    end
+})
+
+
 local repl = {
 --    ["default:dirt"] = "adrift:dirt",
 --    ["default:wood"] = "adrift:water"
 }
 
-function ns.place_plot(plot, pos)
-    minetest.place_schematic(pos, ns.plots[plot].schematic, nil, repl, true, {place_center_x = true, place_center_z = true})
+local function get_intersecting_grid_cells(aabb, origin, cell_size)
+    -- Ensure input validity
+    if not aabb or not aabb.min or not aabb.max or not origin or not cell_size then
+        error("Invalid input: aabb, origin, or cell_size is missing required fields")
+    end
+    if cell_size.x <= 0 or cell_size.y <= 0 or cell_size.z <= 0 then
+        error("Invalid input: cell_size components must be positive")
+    end
+
+    -- Convert AABB min and max to cell coordinates (relative to origin)
+    local min_cell = {
+        x = math.floor((aabb.min.x - origin.x) / cell_size.x),
+        y = math.floor((aabb.min.y - origin.y) / cell_size.y),
+        z = math.floor((aabb.min.z - origin.z) / cell_size.z)
+    }
+    local max_cell = {
+        x = math.floor((aabb.max.x - origin.x) / cell_size.x),
+        y = math.floor((aabb.max.y - origin.y) / cell_size.y),
+        z = math.floor((aabb.max.z - origin.z) / cell_size.z)
+    }
+
+    -- Collect all cell positions in the range [min_cell, max_cell]
+    local cells = {}
+    for x = min_cell.x, max_cell.x do
+        for y = min_cell.y, max_cell.y do
+            for z = min_cell.z, max_cell.z do
+                table.insert(cells, {x = x, y = y, z = z})
+            end
+        end
+    end
+
+    return cells
+end
+
+local function mag_floor(a)
+    return a < 0 and math.ceil(a) or math.floor(a)
+end
+local function mag_ceil(a)
+    return a < 0 and math.floor(a) or math.ceil(a)
+end
+
+function ns.can_build_plot(box, grid)
+    local w = box.max.x -box.min.x
+    local h = box.max.y -box.min.y
+    local l = box.max.z -box.min.z
+    for name, grid2 in pairs(ns.grids) do
+        local i = aabb_intersects_sphere(box, grid2.origin, grid2.radius)
+        if name == grid or i then
+            ns.add_cube(box.min, box.max, {color = "#fff"})
+            -- Translate box to grid2 local space and compute candidate cell range
+            local min = vector.floor((box.min -grid2.origin) /15)
+            local max = vector.ceil((box.max  -grid2.origin) /15)
+            
+            ns.add_cube(min *15 +grid2.origin, max *15 +grid2.origin)
+            
+            if grid2.type == "3d" then
+                -- TODO: implement
+            else
+                for x = min.x, max.x do
+                    for z = min.z, max.z do
+                        ns.add_point(vector.new(x,0,z) *15 +grid2.origin)
+--                        print("Box: "..dump(box).."; min: "..min:to_string().."; max: "..max:to_string())
+                        local plot = db:get("plot:"..name.."_"..x.."_0_"..z)
+                        if plot then
+                            plot = minetest.parse_json(plot)
+                            if box:intersects_2d(plot.bb_min, plot.bb_max) then
+                                return false
+                            end
+                        end
+                    end
+                end
+            end
+        end
+    end
+    return true
+end
+
+--[[
+    Grid types:
+      * "2d": A two-dimensional grid. Building multiple plots within the same horizontal space is not allowed, but plots may change Y level in any way.
+      * "3d": A three-dimensional grid. Multiple plots can be constructed within the same column, but changes in Y level must be quantized to the size of the grid cells.
+      * "2d_staggered": A staggered 2d grid. This is the same as "2d" except that the center of a given cell's edge will correspond to the top and bottom edges of the two neighboring cells.
+]]
+function ns.create_grid(grid, pos, type)
+    ns.grids[grid] = {
+        type = type,
+        origin = pos,
+        radius = 0
+    }
+    db:set_string("grids", minetest.write_json(ns.grids))
+end
+
+function ns.delete_grid(grid)
+    ns.grids[grid] = nil
+    db:set_string("grids", minetest.write_json(ns.grids))
+end
+
+--- @param grid: Grid in which to place the plot.
+--- @param pos: Position within `grid` at which to build the plot.
+function ns.place_plot(grid, pos, plot, owner, rot)
+    local gpos
+    if ns.grids[grid] then
+        gpos = ns.grids[grid].origin
+    else
+        warn("Failed to place a plot on unknown grid `"..grid.."`.")
+        return
+    end
+    local def = ns.plots[plot]
+    local dst = (pos *15 +gpos):offset(-7,-def.size.y *7.5,-7)
+    local box = AABB(dst, dst +def.size *15)
+    
+    if not ns.can_build_plot(box, grid) then
+        return
+    end
+    
+    db:set_string("plot:"..grid.."_"..pos.x.."_0_"..pos.z, minetest.write_json {
+        bb_min = box.min,
+        bb_max = box.max,
+        owner = owner,
+        type = plot,
+    })
+    
+    local g = ns.grids[grid]
+    -- Expand the town's radius to include the new plot, if necessary.
+    g.radius = math.max(g.radius, vector.distance(get_farthest_point_in_aabb(box, g.origin), g.origin))
+    
+    local def = ns.plots[plot]
+    
+    minetest.place_schematic(dst, def.schematic, rot, repl, true, {})
+    
+    local p, gp, m
+    
+    -- Place constructors along Z axis
+    for x = 0, def.size.x -1 do
+        gp = pos:offset(x, 0,-1)
+        p = dst:offset(x *15 +7, def.ground_level, 0)
+        if db:contains("plot:"..grid.."_"..gp.x.."_"..gp.y.."_"..gp.z) then
+            -- Remove adjacent constructors, and don't place new ones.
+            minetest.remove_node(p:offset(0,0,-1))
+        else
+            minetest.set_node(p, {name = "rgt_towns:constructor"})
+            m = minetest.get_meta(p)
+            m:set_string("grid", grid)
+            m:set_string("build_pos", gp:to_string())
+        end
+
+        gp = pos:offset(x, 0, 1)
+        p = dst:offset(x *15 +7, def.ground_level, def.size.z *15 -1)
+        if db:contains("plot:"..grid.."_"..gp.x.."_"..gp.y.."_"..gp.z) then
+            minetest.remove_node(p:offset(0,0,1))
+        else
+            minetest.set_node(p, {name = "rgt_towns:constructor"})
+            m = minetest.get_meta(p)
+            m:set_string("grid", grid)
+            m:set_string("build_pos", gp:to_string())
+        end
+    end
+
+    -- Place constructors along X axis
+    for z = 0, def.size.z -1 do
+        gp = pos:offset(-1, 0, z)
+        p = dst:offset(0, def.ground_level, z *15 +7)
+        if db:contains("plot:"..grid.."_"..gp.x.."_"..gp.y.."_"..gp.z) then
+            minetest.remove_node(p:offset(-1,0,0))
+        else
+            minetest.set_node(p, {name = "rgt_towns:constructor"})
+            m = minetest.get_meta(p)
+            m:set_string("grid", grid)
+            m:set_string("build_pos", pos:offset(-1, 0, z):to_string())
+        end
+
+        gp = pos:offset(1, 0, z)
+        p = dst:offset(def.size.x *15 -1, def.ground_level, z *15 +7)
+        if db:contains("plot:"..grid.."_"..gp.x.."_"..gp.y.."_"..gp.z) then
+            minetest.remove_node(p:offset(1,0,0))
+        else
+            minetest.set_node(p, {name = "rgt_towns:constructor"})
+            m = minetest.get_meta(p)
+            m:set_string("grid", grid)
+            m:set_string("build_pos", pos:offset(1, 0, z):to_string())
+        end
+    end
+    
+    return true
 end
\ No newline at end of file
diff --git a/mods/rgt_towns/rgt_towns_core/visuals.lua b/mods/rgt_towns/rgt_towns_core/visuals.lua
index 9da78b8..e256098 100644
--- a/mods/rgt_towns/rgt_towns_core/visuals.lua
+++ b/mods/rgt_towns/rgt_towns_core/visuals.lua
@@ -1,17 +1,35 @@
 local ns = rgt_towns
 
-function ns.add_line(from, to)
+function ns.add_line(from, to, args)
     local dist = vector.distance(from, to)
     local vel = dist
-    return minetest.add_particlespawner {
+    local ps = {
         pos = from,
         vel = vector.direction(from, to) *vel,
         amount = dist *vel,
         time = 0,
         exptime = dist /vel,
-        texture = "[fill:1x1:0,0:#35f",
+        texture = "[fill:1x1:0,0:"..(args.color or "#35f"),
         glow = 14,
     }
+    if args.attach then
+        ps.attached = args.attach
+    end
+    return minetest.add_particlespawner(ps)
+end
+
+function ns.add_point(point, args)
+    minetest.add_particlespawner {
+        pos = point,
+        velocity = {
+            min = vector.new(-1,-1,-1),
+            max = vector.new(1,1,1)
+        },
+        texture = args and args.color or "[fill:1x1:0,0:#faa",
+        time = 10,
+        amount = 50,
+        size = 5
+    }
 end
 
 --[[
@@ -32,7 +50,8 @@ end
 
  7        8
 ]]
-function ns.add_cube(from, to)
+function ns.add_cube(from, to, args)
+    if not args then args = {} end
     local p1 = from
     local p2 = vector.new(to.x, from.y, from.z)
     local p3 = vector.new(from.x, to.y, from.z)
@@ -42,24 +61,24 @@ function ns.add_cube(from, to)
     local p7 = vector.new(from.x, to.y, to.z)
     local p8 = to
     return {
-        ns.add_line(p1, p2),
-        ns.add_line(p1, p3),
-        ns.add_line(p1, p4),
+        ns.add_line(p1, p2, args),
+        ns.add_line(p1, p3, args),
+        ns.add_line(p1, p4, args),
 
-        ns.add_line(p4, p6),
-        ns.add_line(p4, p7),
+        ns.add_line(p4, p6, args),
+        ns.add_line(p4, p7, args),
         
-        ns.add_line(p2, p6),
+        ns.add_line(p2, p6, args),
 
         
-        ns.add_line(p8, p5),
-        ns.add_line(p8, p6),
-        ns.add_line(p8, p7),
+        ns.add_line(p8, p5, args),
+        ns.add_line(p8, p6, args),
+        ns.add_line(p8, p7, args),
         
-        ns.add_line(p5, p2),
-        ns.add_line(p5, p3),
+        ns.add_line(p5, p2, args),
+        ns.add_line(p5, p3, args),
         
-        ns.add_line(p7, p3),
+        ns.add_line(p7, p3, args),
     }
 end
 
diff --git a/mods/rgt_towns/rgt_towns_editor/init.lua b/mods/rgt_towns/rgt_towns_editor/init.lua
index 5adcd08..c654a77 100644
--- a/mods/rgt_towns/rgt_towns_editor/init.lua
+++ b/mods/rgt_towns/rgt_towns_editor/init.lua
@@ -105,7 +105,7 @@ function ns.place_workspace(name, pos)
     pos = pos:round()
     ws = {
         pos = pos,
-        size = vector.new(1,4,1)
+        size = vector.new(1,2,1)
     }
     db:set_string("workspace:"..name, minetest.serialize(ws))
     minetest.add_entity(ns.get_workspace_center(pos, ws.size), "rgt_towns_editor:workspace", name)
diff --git a/mods/rgt_towns/rgt_towns_main/init.lua b/mods/rgt_towns/rgt_towns_main/init.lua
index 1b97038..73cb1d8 100644
--- a/mods/rgt_towns/rgt_towns_main/init.lua
+++ b/mods/rgt_towns/rgt_towns_main/init.lua
@@ -2,17 +2,20 @@ rgt_towns.main = {}
 ns = rgt_towns.main
 
 ns.plots = {
-    
+    "empty_plot"
 }
 
-rgt_towns.register_spawner{
-    plot = "covered_wagon",
-    label = "Town Charter"
+rgt_towns.register_spawner {
+    plot = "empty_plot",
+    label = "Town Charter",
+    on_spawn = function(p)
+        
+    end
 }
 
 minetest.register_chatcommand("charter", {
     func = function(name, args)
-        minetest.get_player_by_name(name):get_inventory():add_item("main", rgt_towns.create_spawner("covered_wagon"))
+        minetest.get_player_by_name(name):get_inventory():add_item("main", rgt_towns.create_spawner("empty_plot", name))
     end
 })
 
@@ -21,5 +24,20 @@ rgt_towns.register_plot{
     label = "Covered Wagon",
     description = "Hello world",
     schematic = minetest.get_modpath(minetest.get_current_modname()).."/schems/covered_wagon.mts",
+    recipe = {},
+    can_build = ns.plots
+}
+
+rgt_towns.register_plot{
+    name = "empty_plot",
+    label = "Empty Plot",
+    description = "Hello world",
+    schematic = minetest.get_modpath(minetest.get_current_modname()).."/schems/empty_plot.mts",
+    recipe = {
+        "", "", "",
+        "dirt_grass 1", "dirt_grass 1", "dirt_grass 1",
+        "dirt 1", "dirt 1", "dirt 1",
+    },
+    ground_level = 5,
     can_build = ns.plots
 }
diff --git a/mods/rgt_towns/rgt_towns_main/schems/empty_plot.mts b/mods/rgt_towns/rgt_towns_main/schems/empty_plot.mts
new file mode 100644
index 0000000..144da93
Binary files /dev/null and b/mods/rgt_towns/rgt_towns_main/schems/empty_plot.mts differ