Get a decent size of like 26 -32 gauge sheet metal, automotive wetsand asst pack(800-2000 grit), and polishing compund.
Cut it to fit, sand it using 800 and work up to 2000, polish it, bend it, mount it.
If you got the money, have the peice of metal chrome plated.
If you're cheap or broke, use some kind of chrome reflective tape. They sell it at hardware and auto stores. Just tape up the hood.