Thanks a lot pbacot, for the moment I don't know how the roof and the frame were built.
I effect the house is built with only bricks and sometimes few concrete. The builders took everything they had on hand and they didn't have enough quantity. There is absolutely nothing right ! But really no walls and roofs are straight. It's a very good exercise !
Actually i need to make good exterior construction with the walls, because i need to adapt a verenda with existing walls. For the moment i don't need to touch the roof. the roof does'nt need renovation.
I understand your process to built this type. You are right about the roof, it's better to draw all the wood, like this we can make exactly the same "operation". When i go to the house i'll take measure and picture to draw the roof at 100 % with the wood.
Thanks for your request and your help Pbacot ! If you want see the finish draw it's with pleasure !