I'm a small breeder, but here are a few pics.
This is my mouse rack. I made it by installing hardware cloth over the drawers of this storage cart and adding a watering system. I usually have 13-20 breeder mice at any given time.
This is my nursing rack for rats. I bought this rack off another breeder and did the watering system myself.
I don't have a picture of my big rack, which I paid a local guy to make for me. It's the typical type with cement tub drawers. I usually have anywhere from 14 to 22 breeder rats.