My husband and I recently bought a house with an 8x24ft (I was guessing it was 12ft, but I was WAY off) barn in the back yard. I would like to use it as a chicken coop, but I only plan on having 3 chickens at most. Is it possible to have too big of a coop as the barn will serve only as a coop? Also, what is the difference between a nest box and a place to roost? There is a 3-legged fox that lives next door who currently frequents the outside of the barn (the neighbour feeds it). Is chicken wire sufficient fencing material to keep the fox out? Thank you!