That seems like a great idea for a burrowing system. Not sure how it will go, because uro's seem to be free spirits that want to burrow where they want, but good luck with it. it seems like a very cool idea for an enclosure. I'm about to start building my new enclosures, and they will just be the standard 4'x2'x2' stacking cages, though the idea of a huge, tall enclosure sounds quite tempting. The plans for the cages I'm building have a framed front (for the framed glass doors to attach to), so the built in litter damn is only about 1.75-2" tall, but it does work well with my current plan, and my current setup. Right now I have a setup that's actually loosely based on yours (it's where I got the idea for it). I have a short tank, so even a two story retes stack was a little tall (and each stack is only 2" tall, so you can tell this is a short tank). So, I seperated the retes stack, which is about 10" by 11" I believe, and I submerged them in dirt on the warm side of the tank so now the temps are perfect up on top, and it's a fairly long hide, so there's actually a good thermal gradient inside. So far it's worked out great, and I don't need to use as much dirt (about 1.5", but I filled the hide with dirt for her to dig out).
So basically thanks a lot for giving me the idea. I've noticed that sometimes she'll try digging further than her hide will allow (and her cage too for that matter), so with the new cages I'm going back to the drawing board to design a new burrow/hide for her. Since the new hide is probably going to contain more dirt, I'm probably going to use a mixture of a thin layer of soil for the rest of the cage, and probably some slate tiles in some areas. Then, I'll of course have normal hides on the warm side and the cool side, and a designated basking spot for her. As you can see I'm quite excited about this. I'm trying to figure out what I'm going to do for my bearded dragon's new cage setup and I think it's just going to be a combination of good pieces of grapevine and lots of cork bark.
I sort of went off on a tangent there I guess, but since you were talking about your new cage idea (let me know how it works out...and post pics of building it and the final setup...how big will it be?)... I just sort of let loose some of the ideas that were flying around my head. I want her to have the benefit of being able to dig, without having to have 300 pounds of dirt up in my room. Plus, she'll be in the middle cage, so I can only put in a certain amount of substrate. The bottom cage will just be a cabinet for my cricket container for my beardie, and his feeding container (I feed him outside of his cage, it's much easier for me and him...don't have to go searching for crickets later).... but eventually I'm going to want another reptile for that one...I'm hoping for a ball python
I've got college to worry about in a couple years though, so I'll have to put that on hold. Darn you college!!!
P.S. I've determined that when i get typing about something that I'm interested in I write a little too much. Sorry about that.