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The leading 4" of the flap could be magnetic stick-on car door sign material. It's a flexible magnetic sheet.
I hadn't mentioned it because the box will be fiberglass, but if it hinges on that and adheres to the Prius that could work.
Shape-wise, the only problem I see is that the rear bulkhead is rectangular. Ideally, it would be half circular (pace Morelli and aerohead). At the least it should have as much tumblehome as the Prius. More is better.
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