I need to build a new coop for my layer pullets that are currently living with the ducks. I haven't liked our last couple coops(size & function-wise) so I want this one to be done right. How big should the coop be for 14 standard-size chickens? I am not worried about the run size, we have plenty of space and they will also be free ranging too. I do want the nest boxes to be inside the coop, but they will be wall mounted so that shouldn't take away any floor space. I will only need about 6 nest boxes for 12 hens, right?