I have read some really good descriptions and seen some really good videos about how to raise a Skoolie's roof. If I do this, I am going to want to cover up some windows, "merge" some windows together, i.e. install one window where two or three used to be, and possibly change the size of the remaining windows. When should this be done? After the frame is cut and the jacks have lifted the roof? Before the steel extensions are inserted?