Hello from Central Texas. This is my first of hopefully many posts. I need your advice. I purchased a tractor from a local business that is 4'w x 8'l x 6'h. It has a 4'x8' run and a 4x4 coop raised above the run. It has 3 nesting boxes accessible from outside. I am looking at getting Rhode Island reds, Red Stars, Barred Rocks, White Leghorns or birds similar in size. My question is: How many hens can this accommodate without overcrowding? My plan is to also add a larger moveable run to attach the tractor at some point. Does this increase the capacity or is it the coop that limits the capacity? Thanks in advance for your advice and direction.