One of my readers asked for more information on our chicken tractor, so I promised to share some photographs that give more detail. Herb based ours off of the ones he saw at Nature's Harmony Farm, but the following website was also helpful, including the link for the Mark II pdf:
Herb made our door by cutting the cattle panel on the end like the ones at NHF, but I've asked him to make our next one like Robert Plamondon's, using wood framing. We were concerned about the weight, but have been able to move it with no problem and feel the extra wood would not significantly increase the weight. The problem with our door is that it was extremely difficult to cover completely with chicken wire. At NHF, they have livestock guardian dogs and do not need to cover their chicken tractors with chicken wire because the dogs keep predators away. Since our big dog tends to chew on our chickens, we need the predator-proofing!
Some people build their chicken tractors 6' high so they can stand up inside them. We were more concerned about the strong winds we get here on our open hillsides, so we built ours shorter. Since we can't fully stand up inside, we wanted a quick system for attaching and removing things in order to spare our backs;
Despite the few changes we would make next time, we're extremely satisfied with our chicken tractor, and we plan to use it regularly!