I don't have a picture of it, but my mom built something very similar to this design under a treadle feeder to keep the rats away from the spilt feed. Worked like a charm. She just buried a galvanized tub in the ground and covered the top with hardware cloth.
Ducks are messy because of their use of water. Solution: Catch the water before it hits the bedding!
This is a 24x18x8 plastic tote, with a wooden frame built snugly around it, and covered over with hardware cloth. Installed a handle on one side, to easily lift the frame and pull out the tote when it needs emptied, about twice a week. Way better than mucking out wet bedding every day!
Someone in the duck section made one from a plastic drawer style tote.
You can also make a smaller one for ducklings, or build it into a duck coop by having part of the floor as hardware cloth, enough to allow for at least 6 inches of open wire around the drinker.