I just attached a sheet of polished aluminum to the inside of my hood.
Keeping it polished is part of the joy of owning cars like this.
Someone on this forum a couple of years ago did a very detailed and well pictured description of removing the molded reinforcement from the back of a fiberglass hood, bonding on an aluminum sheet, adding the tube frame and then adding an aluminum flange around and riveted to the tube frame.
It looked fantastic.
Cheers
Greg