Just be warned, if you weld on that large expanse of metal near the flat part of the roof, it's going to warp and require some body filler.That’s sort of my plan. I was going to cut above the door section on each side and get a good chunk of metal. I don’t think I need to do the entire roof.
I see spot welds on the metal that remains. I’d just have to fab up the missing part with donor metal.

