That's an expensive solution if it's just for the chickens. OK if it's going to be containing other livestock as well. Why not get yourself a pile of second hand heras type fence panels like you see round building sites? You can make up a pen whatever size you want, where you want, then move it whenever you want. Don't use the block feet that come with the panels just invert them so there's no gap at the bottom and tie them together using cable ties or old bale twine. Ours get let out at about 6.30 in the morning and it's very rare to find them laying anywhere except in their shed even though they have eight acres to roam about.