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I'd cover that center portion with an aluminum sheet (looks like it would be easy to safely secure), and then the rear all the way into the bumper- other than the exhaust. Leaving that open would also let any air escape that may be caught in it.
I was using polycarbonate sheeting for mine because of safety and ease of use, but the jump to metal would be rather costly, and I don't feel safe. ABS plastic I would feel safe with, but why the cost and work for the same result? With the Prius, that center portion would easily handle an aluminum sheet securely.
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