i see where you are coming from david. the main flaw with the half section 3mm plate is that it is not actuallt bolted to the chassis. it is bolted through the upper half section 1mm plate and down to the 1.5mm floor. this is what is introducing the flex.
to remedy the issue i am suggesting the removal of the 1mm upper to which the pedal plate is bolted to.
the flex is not in the 3mm plate its self (this is very well designed as the 90degree bend on the bottom greatly strengthens the plate) its in the fixing points for the 3mm plate. by removing the 1mm plate and making a large 3mm plate you are removing the unbraced 1mm plate joint and by welding the plate to the surrounding chassis rails rather than fixing to the floor.
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