I want to start raising Silver Penciled Rocks in one tractor set-up. Jersey Giants in another. And, Blue Laced Red Wyandottes in yet another. Please help me with some additional information. First, I would like my chickens to have a generous amount of room in the run. But, because of the nature of a MOBILE set-up, keeping things light and easy to move is important. How many sq. feet-per-bird is generous, not wasteful? Is there an effective way of securing the bottom edge of a tractor against predators like raccoons and coyotes? I cannot bury wire every time I move the tractor. Give an example of how I would go about training the Javas (the free range flock) to return, on demand, to a coop every evening? Is 3 birds-per nest box squeezing too many layers into too few boxes? What are some good, fast-growing, and nutritious summer seeds that I can replant in the eaten-up space that we just moved FROM? Winter seed?