Cab floor material?

[mxboy100]

I ripped out the floor in my project race truck, now i have cycled my way back to having to reinstall a floor, im trying to keep lightweight but what gauge/thickness material flat sheet metal would you guys use in this race truck, its a 06 tundra. I am open to using a little 3/4" tubing in some places to help with rigidity but want it to be kept light.

What ya guys think?

thanks!

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[cusico]

18ga cold rolled with beads rolled into it. Or .040" 4130 with beads rolled into the panels that span more than 12".