I like setups like this. I did something similar with a 65 gallon- I built a frame hutch that sat on top using 1x2 framing wood and hardware cloth. THen I shrink wrapped it with window weather sealing. I kept two NIle monitors in it while they were still small. A large 5ft tall tree branch was the center piece, the tank half full on the bottom with some comet goldfish and crawdads. The monitors loved the climbing habitat while they still fit in it.
One day I would like to do something similar, but with more plants like what you have, for both water and arboreal. And then start breeding a bunch of poison arrow frogs. The combo of the lush water scape with a lush arboreal scape would be cool.