1mm sheet should be fine. I'd give a box perimeter at least one central brace bar or maybe a cross and attach the floor to it with rivets or similar, not so much for strength as to stop it bowing and booming if unsupported.
Steve
_________________ '73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!
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