If you lived in Michigan, you could get away with anything. The big 3 do all kinds of tests so if anybody has a car that doesn't look quite right, everybody just assumes it's a test vehicle.

The sign would look cool, too. Or a gassavers bumper sticker.

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Home Depot 4X8 ft. sheet, white only. Don't have a name for it but probably is intended for bath and kitchen use. I found it in a rack with other wall panel 4X8 sheets. It will roll up and when taped fit inside a car.

They had another plastic covered masonite panel, too stiff to do much with and 1/4 in. thick. This is the only solid 1/16 plastic panel they have. Great stuff, works for everything.

I even put a scrap in my fireplace to see how flammable it would be. It never did flame, just melted out of shape. A bonus if used for underpanning. I pop-riveted aluminum flashing to the plastic next to exhaust parts with no signs of melting yet