If you leave redwood bender-board out in the rain it gets as limp as a noodle.
I have a baja'd Beetle in the barn. With no fenders or rear hood, I can locate right off the back of the frame and produce pieces that will fit pretty much any Beetle. I can make a plywood form for one side that slips together like an egg crate, then dis-assembles so I can reverse it for the other side. Double tapered pieces and vacuum bagging.
But first there's a lot of serious thinking that needs to be done.
I'm hoping aerohead drops by at some point.