@JrTheTortoise The indoor enclosure is a tortoise table my husband and I built from hardware store wood; it's 4′ × 4′. Inside we laid down a plastic tarp to help prevent mold on the wood from the substrate. The substrate is mostly coco coir, which I quite like now that I've tried it. He has some small flagstones to bask on under his heat lamps and some tunnels/hiding places, both of which he loves! It's a pretty flat "terrain," but we're thinking of adding a second level and/or putting some live plants directly in his new enclosure when we expand it.