I have taken a child's platform/storage unit measuring 72" L X 27.5 W X 15 " H and created a 3 compartment home for my 5.5 inch Russian Tortoise, Levi. I varied the substrates in each section. He has a UVB flourescent & basking lamp in the hotter area. Temps rang from 87-90 in the hotter area, down to 75-80 in the cooler area. He also gets ample time in my very large backyard during the day. Large lawn, outlined in gravel plus bark enclosures surrounding the trees. "hilly" terrain too. We limit it to days with our supervision because we have cats/dogs/rabbits and even raccoons that run thru the neighborhood so I'm concerned for his safety. I imagine in the winter his time will be permanently indoors so I would appreciate all feedback & critique to get his shelter running OPTIMALLY.