Will be honest, I understand the concept behind it but not a fan of any type of roll over cage attachment on a kart with out seat restraints. Flat cart like motorcycles you actually want thrown away from the kart in case of roll over. If your seat hugs to tight to let you eject properly then it's an improper fitting seat.
If you have a cage like this there is a chance of an arm getting caught or God forbid your head and you are getting crushed by the kart.
Then we can look into the fact that no track insurance will cover you in an accident if they catch wind you are running this stuff and it could be a real loose loose