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I would be interest in this depending on location, will be watching with interest.

Trust me bolt in is fine, I've been over with a bolt in half cage and they work. Also as David quite rightly points out the protection from the front pillar is invaluable in a roll over, I dread to think how I would have faired in my accident with just an RAC roll bar & screen or aero screen, I doubt very much I'd of walked away as I did with a full cage. Just my opinion though

I agree with XTR, a full cage does give far better protection from an impact in many different directions, where as the Roll Over Bar does just that, saves you in a roll over. As with any decision its a personal decision based on how you are going to use the car and perceived risk in doing so. If you are Racing then full cage, Sprinting / Hillclimbing Roll bar, but cage recommended. TrackDays - Up to you ?, Road only - Roll Bar, although some would say full cage in case a big truck hits you !!

For me the benefit of a cage is the a pillar protection if you go off into a fence or railing. Aero screen offers no forward protection and a screen very little. I think rac probably fine for rollover

As Colin Chapman is meant to have remarked that you could hang a double Decker bus of a 6mm bolt. The single sheer strength of a 7/16 grade 8 fastner will be well over 13,000 lbs so I think it is fare to say that the double sheer modes of the rollcage will be alright.

If a group of Areas wanted to organise an event then that may actually be a better way of doing it. It doesn't have to be at Curborough, local Kart tracks can be good for trying Sprinting out. If you organised them after Stoneleigh then they could be advertised at the Stoneleigh Sprint School. Being reasonably local may attract more people.

i forget the size of the bolts used, but if you look at the cross sectional area of metal in the bolts and compare it to either the chassis or even the roll bar tubing itself, the bolt will shear after the tubes not before them

If you're worried you'll snap one of the supports, take 15 minutes to reassure yourself by removing one of them. Once it's in your hands, technically minded or not you'll appreciate it's not going to snap until a lot of other destruction has taken place. It's a staggeringly solid piece of metal, far beefier than any other tube in the chassis. IMHO of course. Ben

My dad tried on similar 40 years ago On tight corners pushing it just twisted at odd angles on to one wheel so he gave up with it I had a powered jockey wheel that I could swap boat to caravan when we had tight parking That worked very well