I love all the pictures and that you explain what you wish you had done differently! I would have liked to see a materials list ( so someone wouldn't have to look for that information elsewhere) as well as blueprints (for the same reason). However, you pretty much stated in the beginning of your article that you weren't going into those details.
As far as the pop door goes, have you considered having it open upwards instead of downwards? That way dirt and stuff wouldn't clog the hing area and it wouldn't obstruct your view from the house! It does look like you would have to mess some more with the window trim though.
Thanks for sharing! I hope you enjoy your chicks!!