Looks, good, but a word of warning with that RTT being cantilevered over the back, you are screwing with center of gravity and weight distribution. Definitely do not tow with the RTT on it like that, and be careful with how much weight you have going to the back. While there haven't been many bent frames on a ZR2, all the ones I've seen have had to much weight past the bed. With that setup I would mount your spare in the bed as close to the cab, rather than a hitch mount carrier.
I would also suggest seeing if CBI offers cross bar lifters (I know Leitner does) so that you can shift the weight of the RTT forward above the cab.
I'm not trying to rain on your parade, just don't want to see you go down a dangerous path with the way the weight is being distributed.
By all means, I'm new at this. I take all advice I can get. I'll see if i can find lifters on CBI. If not, I'll see if Leitner's will work