1968 Valiant fiberglass doors.

As I recall, the windshield on my Valiants have a much
more straight up Windshield angle and way different
Windshields. I guess you could fab some plexy windows
that would fit without any door frames and make a brace to
hold the them in place.
Mopar tried to Make a swoopy fastback Duster/demon changing the roof/1/4s
without changing any more parts than they had to change.

I do have very nice Fenders that are the same as the Duster Demon except no running
lights with headlight installed that fit on all factory brackets for $500.00 that would be
much less work to install and would save a bunch of weight.