I went with one hoop for asthetic reasons (Love that classic look). That being said I wanted it to be a functional hoop that will provide some protection.
Here it is under construction. The 3rd leg runs through to a chassis member under the boot floor.
Unfortunately when I bult it I didn't have the body on. It's probably about 2" too short in my opinion. I'm building a new one that'll be taller. This is something to seriously consider when building your roll hoop. If your helmet is the same height or higher than the hoop it doesn't much matter how sturdy it is. In theory it should be at least a couple of inches higher than your helmet. Mine is about the same height as the top of my head.
Cheers