I am looking for designes for a portable chicken tractor made from PVC and chicken wire. This run would be used during the day to allow my girls to free range under protection from air (hawks) and land preditors (coons, skunks, foxes, etc). Needs to be light enough to move around so the girls won't tear up and kill all the grassy areas. Would like it to be large enough for 16 hens approx 10' w x 20 l x 4' h. I do have a hen house and an attached 10' x 10' x 6' dog kennel run for everyday protection but they have destroyed all the grass and all that is left is top soil that I replace ever so often. Any plans or url address that show how to's would greatly be appreciated. Thanks, Adopted Chickenman