1- Given the dimensions of the henhouse (coop is 6' x 12' x 6' tall), how high off the floor of the henhouse should the roosts be? Remember the henhouse is 3' tall. 2- Again, with a henhouse that is 3' tall, how high off the floor of the henhouse should the nest boxes be? Or can they just set on the floor of the henhouse? 3- Given the height of the coop, how high should the roosts be off the ground? I understand they may not use the roost outside the henhouse. 4- How high and wide should the open door to the henhouse be? I'm referring to the permanently open door the hens will be using to enter and exit the henhouse. We're getting standard size hens.