trent, is someone taller than you going to be driving? if not then you might consider bringing that front hoop down a smidge. maybe one o.d.'s worth at the flat section between the two bends. looks like you've got plenty (too much) room to work with.
hate to see you waste tubing but i think a full mock up of spare or scrap material may help you to see how much room you really have. i usually build a mock up cage piece by piece, bend by bend out of cheap exhaust tubing. then take your finished multi-piece section over to the bender and copy it with the real material.
just a thought. looks good nonetheless.