roll cage ???

Just to add:

Before I started my SFI 25.5 spec build I bought a SFI 25.5 Spec booklet.

A SFI booklet covers the cage and chassis safety requirements for your particular car. You will have to decide where your car fits in relation to the SFI specs required to run your car legally. And yes, I've seen guys bounced during a tech inspection for not meeting the SFI specs.

The SFI booklet contains reference pictures (diagrams) and a complete description of each step of the cage or chassis build process.

It's $35.00 US (plus postage) well spent.

FYI - 4130N (moly) tubing must be TIG welded.

I hope everything works out for you.

My 2 cents

sscuda