Okay. So about 5 sheets of foam-board later the base is created. I think I should go a little taller than 12 inches on the next 3 levels. I used hot glue to keel it together but i applied packing tape to the edges and everywhere it joins for extra support.
I'm shooting to be done with the whole thing by Sunday so I can start decorating the rooms on Monday. This is going to be so much fun.