for future reference, I recommend putting patterns AROUND buildings (in game) for placeholders. plus you have a nifty buffer for placing trees.Edited my town acres and moved buildings and followed the guidelines, but my game crashes when loading up now.
The pink squares represent where I put a flower which is where a building is (villager houses on the right, player houses on top-left) or bridge or PWP.
Edit: Removed placeholders and it seems to work now?
Edit 2: I also misplaced bridges, which was really stupid but didn't crash the game
that's how I do it, at least!