I used commercial layer cages made of 1"x2" wire and added 1/2"x1/2" wire to the bottom. Working good so far. Each of the layer cages was only about 7-9" wide so I removed every other divider to give them some space. I now have 1 roo and 4 hens in each pen. It's a little tight with that many birds but I am just using them for meat and eggs anyway so comfort isn't my #1 priority. Once I get the flock "thinned out" to a manageable number I will go with 1 roo to 3 hens (and pray for the best).