Nice looking tractor.
Did you make the pivots for the wheel shafts yourself or salvage them from something else?
Have you had any problems with wind? I would think that one end should have solid walls so the chicks could get relief from the wind, especially if you are using this set up in...
I think you need quite more chickens per square foot that most casual flock owners have in order to keep your lawn trimmed. I still mow the area in which my 17 layers plus almost 20 11- week-old rangers roam.