[Aussie Mike]

Thanks for the tip SVO. I've got the expanded mesh on the shelf so will probably use it. It's pretty open and free flowing.

The car will be primarily a street car but I plan on doing regular track days in it.

A 2 piece hoop would be easier for servicing the drive shaft. This one piece hoop is still easy to get out from underneath it's just you need to unbolt a few extras including the drive shaft flange to remove it. A bit of a pain as I have to loosen the hand brake cables and unbolt the cooler pump to get it out but access is good from underneath.

I liked the idea of a small diameter hoop that fits closely around the drive shaft. If something does break it won't deflect far as it rattles around in there. This was about as close as I could make it while maintaining clearance and still being easy to remove.

Cheers