Figuring that most early B-body inner door panels are made of a steel upper sill panel stapled to a cheap lower cardboard stock wrapped in interior vinyl material, I found that these along with the inner quarter panels, armrests, hardware were sought of heavy and warped as usual. 14-1/2 Lbs all together.
I created what you see below out of very thin aluminum sheet for the time being. the main panels are a little rough, but as I said, it's for the time being as I will be getting a lighter cardboard stock to wrap with the original style A990 pattern.
The upper sill panel with the glass felt strip or fuzzies in place are also aluminum. Right now these including the inner quarter panel covers and no armrests weigh 5-1/2 Lbs.
Saved 9 Lbs total.
I left the rear inner quarter sill panels steel since they are both a little more difficult to make and are in the area past the center of gravity. This can be applied to a number of body styles, just study your pedigree.