Roll Cage Questions

Highly doubtful your going to get an exact answer here and I'd be leery of one that is not from a known, competent chassis builder. That being said. There are several good, well written books on the subject and you can also use the NHRA rulebook as a guide. I know the trick is to build it "just" strong enough and that no welds can be ground on.

2020 NHRA Rulebook now available online

Jerry Bickel's Complete Guide to Pro Chassis Construction Volume 1