@Daniels118
Sorry for late response!
0. Manny thanks for Your availability to help me!
1. You're right, campskeleton are Weighted straight skeleton which are more useful for YAUP.
2. I imagine an interface like Furniture materials BUT to modify face angle (maybe also the texture) before added to plan.
3. Could be also invent a new kind of furniture (roof) with some specific properties (I don't know how and which) to be able to modify after inserting in plan.
4. I'll be very happy if I could have this java file added to plugin as separate class with ALL dependencies (jutils + etc) or adapted.
5. In such case my job are reduced to make graphic interface and insert object in plan [B-)] [\:D/]
YES I ACCEPT YOUR OFFER!!! [;)]