Sheetmetal floor thickness?

[Barnburner]

I am building a 74 Javelin with a complete perimeter frame. The floor is going to be built around the frame and cage.
What thickness sheetmetal is typically used for the flooring, specifically in the seating areas?

[badmatt]

Not sure what everybody uses, ive used 16g ans 18g mild steel, but tie the seat mount into the cage.

[Barnburner]

That was the direction I was aiming. Seats will be incorporated into the cage. I want to run as light gauge sheet metal as I can without oil canning. I am going to bead roll where necessary. Thanks.

[renegade6]

I just did floors on mine and I used 18 gauge. I haven't cut the crossmembers yet but, with the tunnel, it is really solid. I had lots of oil canning after the bead rolling but, once it was welded in, it went away.