After purchasing a undersized coop I am going to start building the new one tomorrow. I plan on having the run 8ft x 4ft, and the coop an additional 4ft x 4ft. I also wanted a reccomendation on how large to make the nesting boxes for heavies? I have not made a cut yet so any input would be great! I currently have 3 buffs but would like to possibly pick up two more unless the space in not adequate.