My coop is built. Brooding lamps are hung. Layer of shavings on the floor. Roosting rack is built. Feeders and water are in place. Chicks are little and growing fast. Outdoor pen is ready for when they are bigger. Next task is to build nexting boxes. What dimensions? How high off the floor? From what I've read here, it sounds like one nesting box per 3 or 4 birds. Anyone have pictures to post of their boxes would be appreciated.