I'll be curious as to what room is what. I do KNOW that you gotta use tape in certain places to get the walls to stand remotely straight. Don't get me wrong, it's possible to do EXACT standing and connected walls. But I'm NOT Luke Ellison and can't do things exactly. Foamboard. Hard to use. IF you gave me house trim, I'll LOCK the angles in tight!

Go for it! I want to see it. I have YET to make a proper GI Joe base! I like what you are doing and it's good!