It's 2 55gal sterilite tubs. One side (the one that is slightly larger) has about 5" of water that runs through a sump in it and is heated with a water heater in the sump. The other tub has about 4-5" of bioactive substrate with grass growing in it, rocks for heat retention and nail filing, and sticks for climbing. The lids of the 2 tubs are propped up both by the tub itself and a half piece of pipe, the land side lid has a ceramic heat lamp, 65w flood light, and a UVB bulb on it.
The end result is a 5' x 2' x 18" enclosure. With a lot of water (which will in time house fish), soil, and some climbing area. It was relatively cheap to make and works well until the lizard is too large for the setup. I did something similar for my savannah but made a whole lot of stupid choices (way more air flow than the tub needs, installed a fogger which is essentially useless considering the lizard is under the substrate), where as the mangrove's setup is much better... if only it spent more time in the water