They don't really seem that sunken in. What's the humidity of the enclosure? I would recommend that you get some live plants, because Veiled's are known to sometimes bite leaves.
For the custom substrate box, make sure the moisture does not leak through the back, or that insects don't do so. I have to agree, the moisture will eventually penetrate, and there are probably going to be tiny spots that you missed with the silicone that will cause it to absorb moisture.
I don't know if you'd want to start with a rudis. Not only are they very rare and hard to find, but there'd be less people to help you if you have questions or an issue.
Hello everyone! It looks like I need more room before I can get a chameleon, and I have a move coming up, so I need to unfortunately let these boys go. Sorry for the lighting, I couldn’t get good pictures.
The first picture is of Chompy, who is a Raptor poss Snow Raptor ph for Blizzard (he has...