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Did the cats come up with this idea? They look very well read. I did something similar - get 2 big flexi tubs, drill a ton of holes in the bottom of one. Holes should be as large as possible, but not so large that the wood pellets just fall straight through (around 6mm). Put this bucket inside the other, but not all the way - find a way of raising it off the bottom of the other one by around about 5cm. Wood pellet litter falls through to the lower bucket when it gets wet, and some urine will go straight through. You will still need to scoop out the solids.