Suburban chicken owner here though we don't have a tractor. We have an extra large doghouse converted in to a coop with nest boxes on the outside. Our run is a 8x4 covered dog kennel. Our coop is about 16 sq ft & our run is 48. The hatchery sent us home with 2 extra chickens so at one time we had 5 who lived in there comfortably & very happy. We built perches in our run to maximize some of the empty air space & that helped a lot in terms of providing room & free space for the hens. We only have 3 hens now so it's more along the lines of what the guidelines say though I'd agree with you--when I had 5, they were only in the coop to sleep & were all crammed in together in the same spot even though there was plenty of roost space open! We have just built a storage shed in our yard & framed out a 6x4 room on the inside for our new coop. Our run will be 10x6. We have 3 chicks coming & we wanted to be within the guidelines.