FWIW, I agree with George: the real weak spot in the Pantera monococque body/chassis is the huge deck lid opening. A Swedish owner found this by cutting a plastic model open where the deck lid was, then twisting it, compared to a 'solid' deck lid. You can also do this with a cardboard box; one with a 'decklid opening' will be markedly more flimsy. Cross-bracing the huge rear opening seems to work.
In case you're wondering, the front end is fairly stiff, partially braced from the shallow all-welded front trunk floor.
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