Came out nice 6 levels belly heat using 3" flexwatt all on a herpstat proportional thermostat. Constructed of melamine, Each level can hold a 41qt tub(for adult ball pythons) or 3 12qt tubs (for hatchling and juvenile ball pythons) for a total of 6 adult tubs or 18 hatchling/juvenile tubs. I purposely made the side walls and back wall 2" higher than needed so my herpstat, snake hook, feeding tongs, mite off, shedding aid, and a tray for defrosting rodents have a shelf to sit on. I plan to mount an acu rite thermometer/hygrometer on each level to ensure the herpstat is working and to monitor humidity. I'm only housing one snake at the moment so will only use one but will add more as I add more snakes (adding 1-2 in the next month and another in July). I'm happy with how it came out and plan to build my next one out of pvc as melamine is heavy as $&^% . Any suggestions for this rack or next rack are greatly appreciated.