I used them as a base for a simplified version. Did all your plumbing and it works Great. The path I took was just gluing 1×4 stained pine under the lip of the rubbermaid, but first wrapping the tank in insulation, and then using 1 inch pink insulation board between the slats and foil. Then used a 1 inch treated plywood base and screwed that in.
It holds together really well, and in 90 degree Utah heat and sun its holding 39 degrees just fine.
The chiller is the Pod Company product, which is actually just a $280 product if you buy it from the manufacturer - and it works great.
I did my best with the top - the 150 gallon tank has an internal contour that made fitting a 2 inch pink insulation board a real ugly thing to cut. And then sealing it with tarp is not pretty. But it seals tight and looks good when closed. I would recommend buying the cover from Joe.
Final product is great!