I would ditch the light as it's overpowering that small tank. Rotate the hide on the humid side 90 degrees and push it toward the back of the tank (assuming your UTH goes back that far), and move the water dish to the right so it sits on the UTH as well. Leave just enough room so the boa can sneak in and out of the hide. Those ceramic water containers are awesome, once they warm up they radiate heat nicely and keep the water warm. Just keep an eye on the water level as it will evaporate very quickly, which is what you want to keep the humidity up.
You can either cover the top completely with a larger piece of plexiglass and drill a few air holes for ventilation, or a cheaper option is to cover it with Glad Press & Seal and leave a corner open on each side since you know this is a temporary enclosure anyway.
I would hold off on the 40 breeder until your little guy is bigger. I have two older BOA's in 40 breeders set up as I described above with cypress mulch as substrate, and have no problems retaining humidity even in the winter.
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