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The only issue I foresee with octagonal roofs (as well as cones and domes), is that in previous versions, the used a square based footprint. Since this game uses a pull and push system, you could in theory stretch to a rectangular roof. I'm not sure how this will work in regards to roof angles, pitch and curve (I already have a bit of bother with the half hipped roof because elongating one with a curve for example changes the height of the roof).

*Not full walls.

I would love spiral staircases!