Hello Otrhan,
Really interesting about the Banana Effect, It´s not the first time it happens to me, and I now know what that is.
Following what you just said, I will try to allign all of the building, not only the roof, with the previous instructions you gave me, so maybe it helps with the banana effect and then I can only keep the roof.
Regarding the merging component, the angles doesn´t vary between them… So I don´t understand the problem.
I will keep this updated.
Thanks again.