It looks like a nice start on a good tractor, but not for near that many birds. Minimum rule of thumb is 4 square feet each bird in the coop, and 10 square feet each bird in the run.
Now, you can fudge those numbers, of course, depending on your set up. But, at 9 square feet, I'm thinking 8 full grown hens won't physically fit into that coop to sleep. They need over a foot of roosting space each, and your entire coop can't be roost, so that's a big issue right there.
Free ranging can sure help flex those numbers, but unless you're set up to free range all the time, you've got to consider some things that might keep the birds confined.....
Bad weather. Where you live, the birds aren't likely going to be out and about a lot in the winter, and winter can last several months.
Vacations. If you're ever going to leave your home overnight, you'll probably want the birds secured while you're gone. Same for any unexpected travel. The last thing you want to be worried about if you have an unexpected death in the family or health crisis is what to do with the chickens.
Predators. Always an issue. Stray dogs are probably number one, closely followed by raccoons. You'll have both in your AO.
So, I'd either plan to have half as many birds (and still enlarge the coop somehow) or re-work your plan for more space. Overcrowding is the most common cause of behavioral issues in birds. It can be as mild as some bullying/pecking/low production, all the way up to lessened resistance to disease and parasites to cannibalism
