What the hell?
Is it really to hard for you to be able to house them separately? If you can't keep reptiles properly, don't keep them at all. I know of people that have successfully kept Gecko species with Dragon species but that doesn't mean it will work for everybody. Alot of planning would need to go into designing an appropriate enclosure to cater for the needs of the species in question.
I for one would have thought you would know that.