That a BIG improvement Earl!
82c10-If you sand all the dead plastic off, you can use a skim coat of bondo. The problem is when you sand the bondo smooth it won't look right because the door panel is textured. I think it would be almost impossible to try to match the factory texture again.
You might try sanding the whole thing and spray on some rocker guard to get an even texture, then dye it over the rocker guard. It won't have the same grain as stock, but at least it will have an even texture....
I scrounged the swap meet until I found a decent pair of door panels. They were originally blue, but that wasn't an issue. I used laquer thinner and stripped all of the old dye off. Then Roger at Stoked Out sprayed them for me along with the rest of the interior trim. Now everything looks new again....