Looks good.........Me personally I would have run the lower bar all the way across hoop instead of between kickers. And the reason is, because I "think" to be legal with a FC cage, your lower supports must attach to main rail or a floor bar. As constructed you really don't have a spot for lower supports.

And to be clear, by "supports" I am referring to the two bars directly behind driver. Pretty sure they have to extend from top of main hoop to floor. Not sure what you have will pass