The biggest problem I could see with this is heat bulbs. I know AP can put circle screens into the tops of their tanks, and they can put the UV light as a single shop light into the inside of the tank (it will be only about 18" long by the way) but I don't see how you could have two stacked AP cages with heat bulbs. My beardie loves basking under his heat bulbs and I'd hate to deprive him of it.

There are a couple cages that offer stacking plastic cages with the ability to add lights.

Vision Cages.

http://www.lllreptile.com/catalog/37...cages-and-tubs

Showcase Cages.

http://www.showcasecages.com/

Myself... I've never cared for the "look" of the Vision cages. The showcase are a bit better aesthetically. I've never used either.