Cool Tank! She will be happy in there!

Very very nice!!I thought about using mortar for my background: I think it would be easier to sculpt and be more stable: but I also wanted something lightweight (as my terrarium is made of plexiglass/glass).
My backdrop is only about an inch thick and fairly flexible (I was able to make it in one piece 5ft long x 4ft high) out of construction foam over polyester mosquito netting. I had to screw it to the back of the tank so that it didn't sag. The advantage is that it is easy to wash off/sterilize if need be.
I like that yours has more structure to it... another level, etc. I'd love to somehow create a second storey in mine --or at least a ledge. (make more use of the vertical space!)
My Brazilian Rainbow Boa doesn't seem to hang out on the branch much, but I'd like to give her the opportunity to be comfortably higher up if she wanted to.
Send more pics of yours when you can.

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Andrea