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Second to what aerohead said.
I get cut-offs from the local hippy recyclers. for instance triangles of 1/8" ABS 42" on the short sides (US$4ea). If I could find an old satellite dish to use for a slump mold, that would be great. If you had the dish, you could just cut that up.
Or you could drill a hole in a disk of aluminum sheet, chuck it up and spin it in an improvised English wheel, or clay on a potters wheel. It would make something like a big Moon disk with a hole in the center.
Then cut it in half and trim each half to the shape of your wheel well.
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