Nice coop! I'm going to put external nest boxes on mine, too, but I have a few months before they start laying. This will be my first summer with the new coop and I'm anxious to see how it goes. I wish I had some shade to take advantage of like you have done but my property is open pasture.
My next boxes have a hinged lid that opens up for easy clean out and egg gathering.. very convenient. I can gather eggs without going into the run..