Why not weld 14ga steel sheet to the frame? I do not like the idea of taping on panels.Nor do i like the idea of alum and steel rubbing together.
Because the tape REALLY holds well, the 14 gauge steel would be prohibitively heavy, and the two won't rub because the tape separates the two, as it is used everywhere the two would meet. Besides, the steel would create a real rust problem. Does this help?