Guys, seriously. I appreciate all the ideas. I REALLY don't want to damage the original chassis, and I'm not willing to risk it.
I think, based on what I read here, is that I'm going to try a combination of things.
I'm going to slot the fiberglass piece into 3 little pieces with a dremel cutoff wheel. Then I'm gonna hit the fiberglass with some dry ice, get it cold and give it a wack.
If I chicken out half way through that proces, I like the idea of grinding it off, ever so slowly until im right there, and finishing it off with a palm sander. might even be possible to get it ground really close and finish up with acetone on a q-tip swab, unless it eats those like CA does.
Although, that said. It just occurred to me I could bolt the chassis firm and chuck it up in our mini mill and get that fiberglass off of there with a few 1/1000ths to spare and clean it up from there. Gotta be dam careful with the mill.
Sounds like no easy solution and about 4 hours of work no matter what I do. It'll be worth it though. It's a car I like.
