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Taking the last question first -- I wouldn't put more than 5-6 chickens in it, myself, but you might be able to put a few more in with some reasonable chance of avoiding major problems. Even with 5-6 chickens, you will need to move the tractor every single day to avoid major damage to the lawn (every 3-5 days or so, estimated, if major damage is ok -- at that point they'll have it down to bare dirt and be digging holes)
Have you thought about WEIGHT however. This is sounding like an awfully heavy, heavy tractor. You're sure it's going to remain sufficiently moveable?
Also, make sure you *have* enough 12' long absolutely flat pieces of ground to put the tractor *on* -- with a long tractor you cannot tolerate hardly any dips or bumpiness in the ground. Even with a flexible wire mesh skirt that you weight down, you start having too much gappage between the tractor's bottom frame and the ground, and chickens can get out (or stuck under the apron), predators can get in, and the unsupported parts of the frame court structural damage.
Good luck, have fun,
Pat