Here's a close up pic of my homemade cage. Designed it myself, and it works great. The only difference I would make next time is putting in a 1-1.5" dam for the glass doors to sit on. Bedding keeps getting in the tracks. It's 36" long by 16" deep. I used a panel of glass in the bottom of each cages floor to attach heat tape to. The whole thing cost roughly $200 in supplies and about 5-6 hours total construction time.