When you build it be wary a few dimensions are incorrect.
On page 254, in the front wall framing diagram. - The placement of the studs @ 58.5" and 77" is wrong, if you nail these in place without first fitting the window header and sill, you won't get it to fit. 77" minus 58.5" leaves you...
I'm in the middle of building the walk-in coop and so far have found a few errors in the printing of dimensions. It was quite frustrating but fixable. You'd think they'd hand the book to someone to have the work through building the coops on their own before sending it to print. That said...