Maybe you should determine what the monetary value of that stainless panel actually is? I got paid about $300 for a half a cut up milk tank, and that was low value. I wouldn't cut up stainless to put under a car, I'd turn it in, buy scrap materials from the place that I turned it in, and use those, and still walk away with money.
Unless you actually put dimples or stiffening ridges in the panel, it will vibrate. You'll never pull it tight enough to stop that.
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