All I know , is what I observe with my indigos, in particular Mongo. He IS very much like a bull in a China cabinet,...BIG, heavy, powerfull, and not too graceful. And they do have opportunity to climb in, and over their tunnels. I make vertical, as well as horizontal twists in the pipes. Just not way up high where they might hurt themselves, or break something. And while I cannot definitely pin crypto on wood, I did have one indigo die from crypto, and I was using some wild collected wood at that time. Never again.
What this boils down to is a matter of opinion, {{And we all know what opinions are like!}}, and what spacial resources are available to the individual keeper. I don't think this guy has all that much room. Personally I like to give my indigos as much space as I can possibly provide. And if this guy wants to encourage climbing/arboreal activity with his indigos, so be it. But he should know ahead of time, all the possible implications. At some point, some day, I plan to build some giant room size, walk in enclosures, with natural subsrate floors, plants, grasses, palmettos, and trees, and a big swimming hole, complete with fish, amphibians, anoles, geckos,tortoises, and small birds. But for now, I am restricted by the space available in my home. And I suspect, Scott has the same problem. So if he wants to make it 3 feet high, he can. But It's not really necessary. So my recommendation is to give that snake as much room as you have to give. But I would be afraid to encourage too much climbing, and if I did encourage climbing, I would be careful about how I did it. And if he limits his cage height to say, 1.5 ft., he can then build a second cage on top, or a second level for that cage, and/or have room for a breeding pair. In the end, I think indigos like to move period. I don't think they care which direction, as long as they have enough space to move around, and enough stuff to explore. Especially if you take them out frequently. Just don't keep an adult indigo in a 2x2 enclosure that only gets cleaned monthly, and feed it only chicken necks like someone we both know does. Jeff uses cages that are 4x8 and I don't know how high. But I would say that is big enough to safely incorporate some climbing furniture. But Jeff has the space for that. Scott, on the other hand, is limited to 2x6. And I would say that's not enough to safely incorporate climbing furniture. When the snake reaches adult size, and it falls,...and it will fall if it climbs, it could easily fall against the glass, or plexiglass, and hurt itself, in a cage that's only 2 ft. wide. I use Vision cages which are about 2.5 ft. deep, 6 ft. long, and about 2 ft. high. So I don't really have enough hieght available for climbing. And If I could, I would sqeeze them down lower, and longer. But again, it's all about personal opinion, which is based on personal experience. And it's about space available. So Scott, whatever you do, just be careful, and aware of ALL the possibilities. My experience tells me that for your limited space, my method would work fine. In the end, it's all up to you. Good luck,
T.