[elhigh]

Alternate-cutting the window posts is a brilliant idea. Cut the roof straight across right behind the forward cap and just ahead of the aft cap. Shift the whole roof upward and aft one window width. Cut out one window width worth of the roof at the rear and move that to the front, weld it back in at the front and reattach the front and rear caps in their appropriate places. That makes the cutting and welding all in straight lines around wide radii, about as uncomplicated a major body job as you could hope for. Of course you'd still have to come up with ways to close up the gaps that project would open up.

Maybe it would just be easier to cut the whole roof, jack it up and then weld in a band.

As I recall those windows are significantly more than a foot high, so you'd pick up quite a lot of height that way, more like about 18".

That's just excellent. That's an awesome idea.