Great job!! That's the book I'm using to build mine too. I couldn't figure out how to do the Back side under the roof peak. Now I think I've got it figured out thanks to your pic! THanks! You did a really good job!!
I had a patio covered with metal once, and it did get very hot, even partially shaded.
We put some foil-faced blueboard up on the underside of the metal and it cooled everything right down! Since the chickens probably couldn't get to it to peck you might be OK with adding something like that but not having to put a protective screen over it.
No, there isn't enough room inside. I just bought a large feeder and water containers (galvanized, I think) I plan to suspend them both from the rafters to keep them off the ground. I really love my coop, but now I wish I would have made it a little wider! Post pics of yours when you can!