I would also make sure that you have large eaves and gable end over hangs.
The gable peaks could be left open and covered in HC for good ventilation over the chickens heads. Are your soffit areas going to be left open and covered with HC? I would try to incorporate top hinged windows with HC over the openings on all four sides of the coop for maximum ventilation.
Also make sure that the entire run area is elevated for drainage.
If we say a roof is an upside down "V", the "gable peak" is the point of the V right? Now, I'm truly not trying to be obstinate, I just don't understand. If I leave the point open won't the coop just get all wet inside? It rains all the time here... I saw someone mention about little vents that are on either side of the point, but those get clogged up with snow, and I don't understand how the coop doesn't wind up soaked.
How far past the edge of the structure would you recommend that the eaves/gable end overhangs extend? Is 6 in enough, or would a full foot be better? I'm very sorry, I'm not terribly familiar with construction terms. Can you explain what a "soffit area" is? If you have a picture that would help a lot.
I was planning to have a 9ft x 6in strip of hardware cloth running the length of the coop on both sides (comes out to 4.5 sqft of vent) plus two 2x1 windows (with a shutter of some sort) on each of the long sides of the coop (comes to 8 sqft ventilation). That totals 12.5 sqft, which does exceed the 1 sqft/bird guideline, but some people have a lot more than that. Do you think I'd be doing my birds a disservice by not having more?
How do I elevate the run for drainage? (One of the guys I had come out to look at the spot says the spot is good for drainage because it's kind of raised in the middle, so the water should run away. It looks pretty flat to me, but he's been doing this for decades, so he's probably right.
And yes, I know the area is surrounded by trees. We have lived in my house for 25 years, and nobody does yard work. If any branches fell from the trees they'd still be there, so I'm very confident there's no danger of that.