great work!
I have a suggestion where you could make a little extra cash, maybe. You could offer to line the inside of the doors with foam rubber that is stick-on. I did it on mine and it sounds like a BMW when I shut the door. You can tell just by letting go of the handle how much more solid it make the vehicle sound. and it really cuts down on road noise. Since you end up with doors opened up anyway, it couldn't add more than 15 minutes per door. I don't think the tar stuff is that good, but 1/4 inch think closed cell foam is very light and conforms to the sheet metal very easily. I suppose you could do that to all the panels, but the fiberglass is probably much quieter anyway.

Sorry if that is really obvious.

I had the stuff made at a rubber company here in Kansas city.