Here are a few pics of mine. I had the front factory roll bar hoop duplicated and then made the mounting feet and everything to mount the new hoop where the factory down bars normally attach. I then attached the front and rear together to give a strong tie. Next step is to tie it into the frame. Only did this becuase at the dunes, they require you to have full protection over the rear seat.
They key to this, was that the front factory roll bar did not have to be modified in any way, but was still used. I still have all the factory pieces for the rear, whenever I want to change it back.
Are you thinking of doing a full cage or just the rear?
Good luck with the build.