Rollcage foot design

[d.kenny]

Hi all

Im currently building a cage for a track car i have

I have all the tools to make the cage but want to build it to some sort of standard even if it will never compete

Im a bit confused by the msa specs though

It says a foot with captive nuts etc welded to floor with a minimum surface are of 120cm squared however what soze foot is adequate on the bottom of the cage to bolt to said plated welded to the shell?

Because of the design of the sills and where the cage needs to be positioned i cant sandwich the sill so will have to weld captive nuts onto the plate and then weld in and weld fillets to match the contour of the floor pan and sills internally

Am i doing the right thing or not?

Cheers