Bagshaw's Dart Sport wrecked in '74, and was not salvageable. It was Hemi powered, tube chassis, and up-to-the-minute technology.
On the RLB Challenger doors, they certainly feel lighter, I'm not sure I would say flimsy... prior to disassembly they closed fine. However, I have not opened and closed the doors of the completed car with door panel and glass, so I will definitely check that out on Monday. Bagshaw's car even has a strap for driver's side glass, very much like the '68 Hemi cars.
Attached is pic of top of rockers during restoration, even that got some trimming.
