I just made it, no plans. Those are the large tubs and will 15 adult males or 40 weanlings.
I made two sets of frames out of 2x4's, the top or lid frame is sized an inch or so larger then the two tubs. A full perimeter with a center divider where the two tubs meet and more dividers to make the food and water areas. All 2X4'a vertical.
The second set of frames are under support put together like a ladder with all 2x4's horizontal. The "rails" of the ladder are spaced to fit the under side of the tub and the 4 rungs are spaced to fit under the sides of the tubs. So whne the tub is in place, the perimeter of the base is reasting on the ladder.
Some 1/2" hardware cloth for the upper frames. attach the vertical posts to one LOWER frame first, Set tubs in place and set an upper rack on top. Make wheatever adjustment you need to allow tubs to slide in and out and attach the upper rack. Leave a gap and attach the next lower frame. One hint, to keep the posts straight, after attaching the first bottom frame, temporarily attach another at the top of the posts.Stop and guide blocks and watering components and voila!!!
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
26.49 BRB
20.21 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

