Very interesting (even if I agree with the posts saying that it will be complicated in the real world)

Several years ago I briefly used some software or other (IMSI Floor plan, I think), with an automatic roof option. For a simple roof, on a simple plan, it worked beautifully. But was not much help when it came to a plan with more than two walls of equal height and two walls with a gable.

On the other hand, my guess is that a simple roof might still be useful. And to that effect, your approach with a clean interface looks very good.

So - yes - idea very interesting. Looking forward to trying anything you come up with.

ok