I have tested this. I will upload pics later, since I am at work and do not have access to pics. I made an adorable little dollhouse. One room wide, no walls on one side. The only problem I found with this is the game lighting. Because there is no wall it makes all the lights act like outside lights. It drove me crazy. I eventually put the walls back. If you play with the walls half up it sort of keeps the look anyways since the house is only one room wide. I do plan on continuing to play in this house though. Its so cute.