Hi. I am building the Walk-in coop p 251-268 of the book? Can any one tell me if the rough opening width of the door on the front wall given on p 254 is correct? The headers are given as 39 3/4 inches wide and this would give a rough opening of 34 3/4 inches. This must be too big for the door... Anyone encounter this issue? Perhaps Rob Ludlow might be able to help.