I have a really first class kennel set up at my place. Insulated, vinyl siding, heat, a/c, hot/cold running water, laundry, stereo, built by contractor. There are 8 runs on each side, but I'm only using six total now. I'm wanting to buy Cornish X's and I am wondering if a concrete floor both indoors and out would be okay if sufficient layers of litter were used. This would save lots of money vs constructing a new pen and I could control their indoor environmental needs much better. I could make a cheap-to-build chicken tractor to allow them access to grass and weeds during the day while I'm at home, and put them in the outside run of the kennel which I would predator-proof when I'm not home. There would be a gang plank with a rise of about 8 inches for them to use for going back and forth indoors/outdoors. I would probably not use litter on the outside run so that cleaning it off with a hose would be easier, unless everyone thinks I should use litter. I just wonder if a bare concrete floor will cause their legs to "splay" out more easily. I kept small dogs so the inside compartments are 4x4 and the outside are 4x10. If I order 25 chicks, how soon would I need to expand from one 4x4 to multiples and how much space would they need at week 7 if most of them survive? Also, should I order all hens and keep them longer, or roosters? I don't plan on caponizing so I wondered it hens would be better in the long run? More feed vs expense of castration, or just get straight run and forget about it. This will be my first meat bird venture.