I turned that old mice rack into my new jumbo brown coturnix quail house! Each section (except the top one because I can't measure correctly!) is 12in high. All of them are 24x24in living space. Under each one an old panel that can be pulled out and cleaned off. I want to find some plastic trays of some sort that would fit and not cost me a fortune because they will last longer. In the mean time, this works.