Just Some Dude in Jersey
I had to scrap the idea, Uwe Klippert explained that the body of a GT door is roughly the same size as the window opening and that, because the gullwing mod shortened the door body, there isn't enough room inside the door for the window to fully retract. If I make the window short enough to descend all the way into the body, then there won't be enough window left to fill the window opening when rolled up and it will stop short of the top. For me, it's all about being able to comfortably rest my arm on the window sill when it's down. If only 1"-3" stick up, I might be able to fashion some sort of temporary removable pad to slide over the bit of glass sticking up.