I'm glad it work for you.
1. The problems with Generate Roof please post on dedicated trade.
2. It appear I waste time (~2.5 hours) to write the tutorial for you while you stop reading at point 3 from 19 + the last statement.
It's not fair for an guy around my age.
I'm not a native English and for this reason I can't afford to write "blah, blah".
It appear it is my fault; I didn't try hard enough.