"I'm still not too clear on what the stock hood insert is made of. Is it fiberglass, or fiberglass on top of something else, or what? I'd like to get some local estimates on getting mine repaired, but I reckon I need to know what it's made of first..."
tworavens,
I was told by one of the guys I got an estimate from that it is SMC (or something like that - I'll edit this post if I ever find out for sure). That stands for Sheet Molded Composit (I think). Basically it's not fiberglass & that's why the repair estimates are so high - fiberglass resin just won't stick to it reliably.
I'm going to try to do the repair myself using this stuff I've had good luck with in the past called PC-7. Home Depot is supposed to be a distributer but I used to get it from True Value.
I've already promised my current insert to another member but I'll try to keep fixing them & making them available if it all works out.
Tom