Hi, I am a first time chicken owner and I am going to be building a new coop. i was wondering if i need to build the coop so it is moveable or stationary. The chickens are going to be free ranging, and the field that they are in is only about 4 acres. also when figuring out the size of the coop. I would like to build the coop with enough room to house 2 dozen chickens. i was planning on building the coop 11 ft.long x 8 ft. wide x 6 ft. high. would these dimensions be sufficient to house 2 doz. laying chickens.