If it's a track car - and the floor pans have nothing to do with structure... then I'd make them with a thin gauge and bead roll or otherwise build them with some structure so they don't just oil can etc. Why add weight...
Depending on your skills - and equipment - you can make smaller panels as service panels which will also add some structure to them.
I have an air driven flanging tool - that a guy can simply run around the edge of the panel - and the adjacent panel can get flanged in the opposite direction if you want that look or just bead roll it and lay it flat etc ... and you'd be amazed at how much something like this can stiffen the panel.
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