Superman1984
Cruisin' on my Bluebird
This is what I would do but he was insistent as doing it the way they would have in the '40s. If it's fiber I wouldn't attach it to the bicycle but for looks. That thing has bound to be delicate/fragileView attachment 1384942
Trace out plate on a thin piece of metal flashing leaving a mounting tab on top or bottom and cut out pattern with tin snips. You can then wire plate to it to keep it rigid and then mount it on fender or hang from seat . You can patina up the metal with white vinegar , peroxide and salt if you want.