Well, like I said, he's not mine, and the last time I saw his setup, it was a ten gallon tank with a little log hide and wood chip bedding. When I asked my friend about her humidity, she said she keeps it around 60%, but I didn't ask what substrate she uses.
I'll tell her what you said about the super glue, as I'm just keeping him over night and she's had more experience handling them. (I'm not afraid, but I'm not to the point where I'm exceedingly comfortable with excessive handling.)