wow! Nice job! I, too, love the rain barrel/gutter idea.
You might be surprised how many ladies can cram in on a favorite roost! I have to change my roosting layout in my summer coop as it is about a foot too short for all 16 ladies to fit on the top rail. They pile up there, crammed like sardines - all very crabby but NOBODY is budging. Crazy ladies.
Very nice coop and run. Enjoy the peas!