Hens live in converted outdoor loo with a chicken-wire run that is about 20ft x 25ft.
Usually have between 4 and 20 hens.
Garden is 5 acres but there is grazing/arable land as well.
Pen isn't movable but they do free-range out of the pen. But not at the moment because we have a fox visiting during the day.
Tortoiseshell - I'd go with your ark and move it around to keep the ground fresh and the hens occupied.
Malory - I've never had a cockerel, when we have a full flock they usually appoint a Head Girl to keep them in order. (Actually, the fattest hen appoints herself)