I made this chicken tractor which I have humorously referred to as the World's Greatest Chicken Tractor. It is a work of art, but has a lot of handy features built in to make is a very functioning chicken tractor. Of course, the tractor part means that it has wheels allowing it to be moved around from one area in my yard to another. I have a site with more explanation and pictures at http://greatestchickentractor.com/
I have an automatic feeder and waterer built in and the nesting boxes are on the back. I have a number of security features because in my area there are all types of predators looking for a free chicken dinner. I use a winch and cable system to raise the wheels and it moves fairly easy from place to place.
There are four nesting boxes in the alcoves on the back. They open to allow egg retrieval, clean out etc. Inside are the roosting poles and the round windows allow a lot of ventilation. I would love any feedback you may have.