The roosts are the 2x2s which run 92" long on each side. The plans are there in both downloadable pdf and pictures with follow along guide.
This was my very first wood project .. I think I did real well.
This can roost 12 chickens comfortably -
This is the link for plans and dimensions and all you'll need free! I'm almost finished with one ! http://blog.homedepot.com/free-plans-for-an-awesome-chicken-coop/