Nice job! I have been wanting to build a habitat for Blue Dart frogs, but I'm still a beginner and wanted to start easy first.
One comment - I agree X-mas cactus are beautiful, but I really don't think it will do well in that environment. In order to bloom they need to have the natural rhythm of the shortening and lengthening of the day. That's what actually triggers the bloom. If you keep lights on for heat or what ever for a set number of hours per day, it may never bloom unless you decrease the day time light. Also, they do need to dry out in between waterings, otherwise they will just become soggy and die.
I hope this helps.