If round walls are the problem, try thinking two half circles for the outer walls. Use wall tool and
- place cursor to the left, click and pull a wall to the right side of the circle,
- use CTRL-click to finish the wall, (enter lets you write in 180 degree arc),
- continue back to staring point, CTRL click again.
You can also enter/adjust the arc in the modify walls dialogue after you have created the walls.
You cannot draw round floors manually, but if you double-click with room tool inside a room, the room will follow also the round walls.
Windows can be a bit tricky as they do not align normally, but you can find some tests in SF 3d models 295. For roof, search the web, or look in SF 3d models 330.
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