Originally Posted by tech69
we did but we realized it would have required more work to get it to fit right. The original fit well.
You either have a bunch of work making the urethane one not warped, or you spend a bunch of work making the fiberglass one fit, both require a bunch of work.
The fiberglass one is permanent. The urethane, maybe not so.
I know you are above this "Basics" but something may be of use. Fiberglass Part Fitting - Autobodystore
Just be sure to tear the mat like Randy taught us! (damn that's a good trick).