I would say that 8mm Ally is a overkill for a floor.
We use 5mm Polycarb on THz with no problems, but that wouldnt work very well on a steel frame.
3 mm 2014 T6 should be plenty. If that costs too much, 6082 T6 is cheaper but somewhat less strong. Avoid checkerplate or any other general-purpose ally (e.g. from a DIY store) - it is very soft.
2014 T6 is stronger than mild steel. We use it a lot (our bot beta is all 2014). 7075 T6 is even stronger than 2014, but is not generally available less than 1/2 thick.
http://www.technobots.co.ukwww.technobots.co.uk sells sheets of 6082 T6 (Materials & Hardware | Engineering Materials)
http://www.metalfast.co.ukwww.metalfast.co.uk sells 6082, 2014 and 7075 in sheet, round and rectangular bar. They cut it to size and youre only charged for what you buy.
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