I am trying to decide between a fixed, permanent site coop and a movable one. I want a dozen or so chickens, space is not an issue but essentials are the usual, access to nestiing boxes from outside, predator proof (we have most of them) and place to store feed inside. Have ideas for ventilation, lighting, all the rest and have the materials. Will start building this winter for Spring (June) move in. I know each has its respective advantages/disadvantages but eager to know your thoughts and experiences. Thanks in advance!