We've got an ordinance in our city that requires the chickens to have a pen with a minimum of 144sq ft. I only plan on 4 or less hens (yes, I know this will change). I've got 1.5 acres or so, and I'd prefer a tractor that I can move around. A 12x12 tractor would be cumbersome, so I thought of making a tractor that had some fold out wings. This would allow my to have my 144sq ft without having to move a 12x12 or worse around the yard. Thoughts?