diff --git a/src/main.lua b/src/main.lua
index c742906..36ef4ab 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -53,9 +53,63 @@ local function selopt(options, title)
         end
     end
 end
+local function integritycheck()
+    if not fs.exists("designs") then
+        fs.makeDir("designs")
+    end
+end
+local function posasstring(...)
+    local positions = {...}
+    local out = ""
+    for _,v in pairs(positions) do
+        out = out .. tostring(v) .. ":"
+    end
+    return out
+end
+local function newdesign()
+    local buf = {}
+    local dimensions = {
+        x = 8,
+        z = 8,
+        y = 1
+    }
+    local currentfloor = 1
 
-local action = selopt({
-    "New Design",
-    "Print Design"
-}, "Select Action")
+    while true do
+        -- render buf
+        reset()
+        for x=1,dimensions["x"],1 do
+            for z=1,dimensions["z"],1 do
+                local currentbuf = buf[posasstring(x, currentfloor, z)]
+                if currentbuf then
+                    term.setCursorPos(x, z)
+                    term.blit(" ", colors.toBlit(colors.white), colors.toBlit(colors.white))
+                end
+            end
+        end
+
+        -- user input
+        local event = table.pack(os.pullEvent())
+        if event[1] == "mouse_click" then
+            if event[2] == 1 then -- left button, set
+                buf[posasstring(event[3], currentfloor, event[4])] = true
+            end
+            if event[2] == 2 then -- right button, erase
+                buf[posasstring(event[3], currentfloor, event[4])] = false
+            end
+        end
+    end
+end
+
+while true do
+    integritycheck()
+    local action = selopt({
+        "New Design",
+        "Print Design"
+    }, "Select Action")
+
+    if action == 1 then
+        newdesign()
+    end
+end