Looks nice. Can't think of anything else.
Have you ever used the Excavator clay substrate? You mix with water, form and let harden. I really like it so far. I use it for my bearded and Uro. You can form caves and ledges out of it. I built each a cave. My Uro has dug away at his that it's almost topless and my bearded only used his the first week. I may have made it too small. But they can dig in the stuff themselves too. It's not cheap but fun to work with and more realistic. Anything else I used, coir included, just too messy.