Danny - I have R & M fiberglass on my bay doors. There is really not much to it... the old skin is pulled off and the fiberglass is fastened to the bay door frame. Makes the door "lite and breezy" to open. The covering is flat sheet fiberglass. R & M's website is a little stale, but they are going stronger than ever. Check them out at http://www.rm-fiberglass.com/
If you plan on going to Bus's USA here in Oregon, R & M is not too far away from the rally site.