Hi i think it would depend on the floor thickness i used 3mm ali floor and i have no flex in mine it is also bolted to the front bulk head plate which i uprated to 3mm also to stop any pedal flex
just a note if you are using the book plans for the pedal box i would uprate the pedal thickness to 5mm plate i have heard of brake/clutch pedals bending when using the book spec 3mm plate for pedals
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