12-Sided Tower - Modular Miniature Terrain

I wanted to make a modular tower that I could print and possibly re-arrange later if the need arose. I could probably (and may eventually) do other polygons, but for now I have a 12-Sided tower that can be built as high as you're willing to print parts. The pieces will stand on their own stacked, but I plan on gluing together sets of four to make each floor. I don't think they'd be stable enough for play on their own. I will eventually make bridges so you can place them across doorways at higher levels. I may work on a working door piece too.... this kinda fell together over the weekend... so I have pictured what I've printed so far. Suggestions are welcome, I think I've just scratched the surface of what I could potentially do with this. There is almost no need for supports on these parts. I tried to keep that in mind as I made these. The archway in the door is the only part I printed with supports. EDIT: 6/19/17 - Added hollow stair version with offset window. EDIT: 6/25/17 - Added 5 new building sections, double open and closed doors, windows, etc.