Enhancing on the parts found at http://www.thingiverse.com/thing:2998...
I've printed multiple parts together (combo files) and the openings are really so modest the sections are joined together during printing. I enjoy them joined, although I believe they may be broken apart.
So folks can quickly change the layouts, I'll upload a zip file of the components in STEP format. As an example, you can join different bits and then print them to save time and also make the entire thing a bit more tough. I 've stl files of three mix pieces contained. (2x2_combo_right, 2x2_combo_doorway, and flooring_2x2)
More components as they get accessible.
Print whichever bits you would like. The flooring bits hold down the wall bits. For large regions of flooring, there may be some little openings determined by which floor tiles you use.
As a hinge pin, I make use of a piece of paperclip for the door. For those who own a drill the right size, drill a hole in the door as well as the doorway to coincide. If not, I simply use wire cutters on a straight piece of paperclip and leave the "little" in the hole when ended.