Chris, I plan to use heat lamps to heat in conjunction with a uv light given the way I plan to construct them. Each enclosure will have plenty of back ventilation. Boltless Industrial Heavy Duty Shelving Garage Steel Rack...
I hope that link works, if not they are on ebay.
Mike, I haven't got any yet but one will make 4 enclosures, not to big, not to small and not to high and they will fit where i have space for them. 3 standing next to each other will look quite good. the beauty of it is you can work on one set at a time and add a set as you expand. The way work (none existant) and finances are atm it is the cheapest option for me.
Have just found a better set 180x90x45 which should give 4 x 90x45x45 enclosuresHEAVY DUTY BOLTLESS 5 TIER SHELVING STORAGE 265KG UDL