That is an awesome enclosure!

Has the heating/lighting combination continued to work for you? I ask because I anticipate building something along the lines of a 6'x2'x3' naturalistic enclosure for my longicauda boa in the future, and I'm thinking of switching over to a basking light as a heat source (for the near-infrared) and only using a RHP as a backup. Has the metal halide + T5 combination been enough to keep ambient temperatures where they need to be? I'm running a 24" Arcadia ProT5 6% Forest in the 4'x2'x2' I have set up right now, and when my room is warm, it's enough to keep warm side ambients where they need to be without the RHP kicking on (which has led to some juggling to keep a basking spot).