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PVC is evil stuff, but the scrim-reinforced vinyl that is used for truck tarps is very durable and available in black and can be shiny. It is easy enough to sew or can be RF or hot air welded. There is clear vinyl that could be welded or sewn-in as a rear window. It could be supported by an inflatable cone sticking out horizontally from the back of your car with no rigid elements making it easy to stow for low-speed city driving. You could use the exhaust pipe as a compressor for inflation. Urethane-coated nylon or polyester would be a good alternative fabric.
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