I would provide 11"x36" of heat tape under the floor toward the back of the enclosure as a basking area since your reptile room is already at the optimum cool side temp.
Replace the mesh top with plexiglass or PVC to keep the humidity inside, maybe put a small RHP on it in case your boa wants to perch and bask. Maintaining humidity in that tall of an enclosure will be your biggest challenge even with a large water dish.
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