I want to do that too! Still trying to figure out how to make it work though lol
The best idea I have right now is a free standing viv above the tank with a hole in the floor for a ramp, lighting for the bottom tank built into the floor of the top, and probably have the lower tank on a roll out shelf to access it. The top one would need the sliding glass doors for access. I'd need to sketch it out still and see how it would look and work. Maybe someone else has any ideas?