I have to disappoint you: That is not a beetle, its a roach. Definitely! And its not one of the nice feeder roach...its a pest species (Blatta, I guess).
Sorry for that.
With respect to your viv: Nice and big, but I would add a fake rock or bark backwall to provide extra climbing surfaces and help the lizards to feel secure. Also I would add much more branches and provide significantly brighter lights (metal halides are a must IMHO).

Best regards

Ingo