Location for gaming: Do any of you guys currenty live in a condo? Inquire whether or not the condo has party rooms which can be reserved by its residents. Bring in a screen and your equipment.

Planning house/rooms: Live Interior for Mac OS looks very nice and includes a lot of pre-made models as well as support to import Google's models. http://www.belightsoft.com/products/liveinterior/overview.php