Hey there, total noob here but having a blast so far. Was wondering if there's a way to erase/destroy/remove a back wall? I built a house using dirt walls early on, now I want to upgrade to brick or wood walls, but I can't just "paint over" them and since they're background nothing I swing will hit them, either. Is there a trick or am I sol? Also, anyway to make a trap door? I was considering a tunnel under my house but my tunnels always seem to get filled with zombies so wanted to put a trap door on there to keep me safe and sound when the undead are roaming.