Thumber, I believe you missed on a few hits back. I am in the process of getting a quote for the cranks and levers to be sand cast in aluminum. Plastic would probably be too weak and not consistent with my metal objective.
Those early B-body crank and door latch levers are heavy for their size and functions. The only weight related thing I did a few years back was to exchange the long door window cranks for the shorter stubbier quarter window cranks. Did not weight the difference though.