I have just over thirty chicks about 10 weeks old. Their coop is a 10X8 metal shed inside about a 50X50 ft fenced in run. I let them free range during the day and they put themselves up at night. I am in the process of building some nesting boxes and I would like to ask if I could build my boxes outside the coop with no entrances from the coop. If I connect the nesting boxes to the coop I would have to cut the metal building so they can enter it from the coop. I want to build it so the hens can roost by entering directly in the nest from the run. I would have a roof but the front of the nest would be exposed to the elements. All of the nesting boxes I see are either inside the coop or connected. Will this work? Also how many do you think I need?