$2000 sounds like a good deal. I know someone who paid $6000 for a custom welded-in cage in their Mirage and that was heavily discounted and materials were next to nothing compared to normal costs.

I found this resource that outlines Victorian guidelines for street registered vehicle cages:
http://www.vicroads.vic.gov.au/NR/rd...65/0/VSI28.pdf

They don't clearly state 4 or 6 or X point cages to be legal etc, but they do go into detail about the restrictions and my conclusion is that 6 would easily be possible, however I couldn't determine whether or not welding the cage in would be legal (at least without having an engineers certification). It gets a bit ambiguous in parts like that.

I don't really want a bolt in cage, to be honest, but was more wondering if there are pre-designed or pre-fabricated sections that can be welded in two or four points at a time... does that make sense?

At any rate, if welding is permitted, then I'd be more inclined to go with a full 6 point custom cage.

It's sitting pretty far back on my to-do list at the moment, but if I can fill in a few Sundays stripping the interior, then why not...