Y'know, if the door glass doesn't have to roll down, there's the vent frames & glass and the regulators to consider. Plus the aluminum upper door frames the 4 '65 A/FX hardtops had - they also had the same deal to support the quarter glass.
Some ATVs have plastic interior door handles & lightweight latches and strikers, but that might be pushing it on a street car or in an emergency.
I assume the access covers & splash shields have already been set aside.

Damn, Lee, you make most of us look like slackers!