I have seen some very cool cages that were made from large tanks that then had a cabinet built to sit on top, essentially making an arboreal display cage with the ability to hold some water on the bottom.
How high up is the leak? Can the cage hold any water? What if you only had half of the bottom hold water?
I think you could do some very cool stuff with a 6' long aquarium.
-----
Current snakes:
0.0.1 Gonyosoma oxycephala - Java locale (green)
1.2 Gonyosoma oxycephala - Jave local (green)
2.2 Gonyosoma janseni - Seleyar locale (all black)
1.2 Gonyosoma janseni - Celebes locale (Black & Tan)