The material is aluminum and can be "engine turned" on a drill press. You need a guide that can be moved to keep the swiriles in line and you nest the next row like stacking oranges. Takes a little time but not difficult. G.M.
this is a `32 panel that i engine turned. contrary to what has been posted above, the original panels were carbon steel that was copper, nickel plated, engine turned and then chrome plated. to engine turn nickel requires a special technique, otherwise the nickel will "smear" instead of "cut". i can restore your panel to the original condition, please P.M. if interested.
tom