I personally never have and not aware of anyone doing this on the 64. You should be able to either use sheet metal or fiberglass and make a custom one. For the rear roll pan I would follow the fender contours from each fender across the back of the car. On the front just look at some of the race and high performance cars to get an idea of what you would like to design for yours, if you or someone whom you know are good at drawing you might have a few designs done on paper and see which you prefer.
You might contact member DV06LTZ (D.Vierstra) and ask him about his ideas, he is a Illustrator/Graphic Designer/Photo-Chopper artist.
I am working on the floors right now. Rear pans done. Replaced front floor brace and patched inner rockers where brace attaches. Working on front pans now. Front suspension completely rebuilt. Posi unit on the way. Building it for my son's first car. He just turned 14. Running out of time. Thanks for the input. If I pull off a unique front/rear look, I will post.
got any pics of the fron and rear with the bumpers off... ever thought about sectioning the bumpers and tucking them closer to the body, maybe even cutting a recess in the body for a sectioned bumper???:headbang: