I took a piece of plywood, cut it in half, then used wedges to hang that from the wall of my hen stall about knee high, making a nice platform.
After that, I took used Tidy Cat kitty littler boxes (the 35 pound size), then attached a little ledge to hold the kitty litter boxes on the platform. If you wanted to, you could also nail in blocks to hold them in place better. This way I can just lift the buckets off the platform to dump them out to clean.
If you wanted to permanently hold them in place, you could nail or screw them into the wall, but I like being able to pick them up, dump them in the wheel barrow, and put them back in place.
Therese