G'day Rolla, welcome to the forum.
Yes the driver of the Group N Corolla is named Adam John. The best place to find the roll cage specs is in the Cams Manual. Basically, you cna build a cage as per the diagrams in the book or if you design your own, it will need to be engineer certified. The regs which came in last year are very strict and I'm sure mild steel is out. I think it has to be CDS steel.
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