I like the old school chop on the Chevy.
You already knew to cut out the back corner of the fifth window so you could move it forward.I usually end up splitting the roof right down the center of the door and adding a filler strip,so it will reach the a pillars.
I see what you mean about needing a new roof,I bet you can get away with just doing half of the roof.To me it looks like the b pillars back.
How much did you lean the rear window forward?Also what was the chop,3 in the back nothing in the front?
Oops I forgot to welcome you aboard,welcome aboard