Now things have developed so that I just let the bantams range free. The neighbors don't mind, in fact, they seem to like them scratching and getting the insects. I do have too many roosters crowing too early for my satisfaction. This photo captures the essence of a chicken tractor. I have feeders and waterers suspended from the wooden cross pieces.
Some mixed bantams are on the roost bars, a pair of Japanese bantams on the ground.
The green tarp provides good wind break and shade for the fowl. I used the tractor as a chicken coop for a period of time, but more recently I've been using it as a holding space for ducklings to mature a bit before moving them to the outside fenced areas. I visited their site and found an interesting selection of books. One in particular which deals with building poultry houses and coops appears to be very good.