Maybe Clarke can be of assistance on this one since he has an '82. Looks like there would be quite a bit of metal to be removed to change to rectangular windows. There is a limited amount of wiring running vertically in walls. Most of the wiring is run near the ceiling or near the floor.
I will take a look at the rivets on Clarke's coach tomorrow but I can't imagine the ribs not clearing at the widest portion of the current window so if you could keep the current max horizontal dimension you should clear the aluminum ribs.
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