My friend has one of those "cubicle shaped" Exo-terras that he set up as a planted viv for a pair of Braz Rainbow Boas.
So far, he has 2 large bromeliads as the main plants in a bed of homemade ABG soil-mix, with plenty of cork half-rounds and piles of magnolia leaves for cover. I keep telling him to add more plants.
A piece of hollow cork round serves as a "planter pot" for the larger bromeliad, while another piece of hollow cork round hides a clear plastic water dish made from the base of a 2liter soda.
The overall effect looks nice, he keeps it heavily misted for humidity for the BRBs. They seem to like it.
As for heating, the tank already had a UTH bonded underneath to the glass, so what he did was create a shallow depression in the soil over the heat area and uses piles of cork hides if the BRBs want hide in the heated area.
There is a simple overhead florescent tube bulb for general purpose lighting, but not for overhead heat.
IMHO, nature provides overhead heat, so if there were bulbs/tubes that can be used to supplement low-temp UTH (to avoid cooking dirt and plants), I would prefer to go that route.