yeah that & oh Rails, Knuckles & 1/2 a cage
I think you've identified your biggest issues already eh
cage will need MSNZ membership, along with recent events (to prove gets used or at least passes inspections)
and an Authority card (also MSNZ) : some will argue one of these tops the Cert card eg : lets you get away with a few extra 'allowances'
we have a few racers here that drive their cars but doubt that a half cage will even get close to being accepted eh
they are worse than bolt in's for most motorsports (as in, just don't)
also means Seats, Belts and airbags (if any) will need to be sorted too
eg FIA approved etc
until