I’ve been lucky enough to have a dad that worked in the a/c, heating industry and any time I needed a bench cover he has got me sheet metal to cover it, galvanized or stainless steel.
You might could call a duct shop and see what they could sell you.
I always thought every time the space shuttle went up they should have grabbed any defunct US satellite or parts and removed them.
If I remember right a Chinese satellite that had a decaying orbit took out another satellite a couple of years ago.