I don't have any pics but I use the Animal Plastics racks that accept 2 15qt. boxes per shelf or 1 32qt. box turned sideways.
The racks are 11 shelves tall and have been modified to use flexwatt and provide belly heat. These units are a few years old and originally came with cable heat that was in a slot right at the very rear edge of each box. Earlier this year two of the cables failed and so I replaced the cable with flexwatt. The cables lasted 5-6 years which isn't bad for cable. I also use an AP hatchling rack. That unit is 9 shelves high and accepts 3 shoeboxes per shelf.

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