I'm building a coop, the coop itself is 16 square feet, not including the 3 external nesting boxes which is 3 square feet. The run is 64 square feet. I have 10 baby hens (5 speckled Sussex and 5 Orpington), I know I'm obviously not keeping all 10, but I need to know how many I should keep. I was thinking 5 chickens, would that work?