Timber Row House Beta

The idea here is to make a series of interchangeable level1,level,2, maybe level 3, and roof parts to make side-by-side timber frame urban houses for dense population. I would also be making ends and turn parts as well. It would probably be spread out over a couple months as I have other things to do. These are single family dwellings but they are meaty. 1st floor play area is 5.5x4 inches, second floor is 4.5x6.5+ inches. Not a castle , but enough for a party of 3 or 4 to explore. walls are not super tall so things stay visible without cutting walls. A lot of wall details here. Please share feedback