This is one of the better built DIY pre-fab chicken coops we looked at before finding a different custom assembled one at our feed store. I love the way you have raised it on a platform for safety from ground floods and for ease of reach during cleanouts.
In open exposed free-range areas put some low-ground lean-to's for the chickens to dive under from aerial predators. It's amazing how savvy hens are when there's no roo but having hiding places is crucial to their savvy survival - especially if you can't watch them the whole time they're free-ranging. We even recycled an old dog house for them to use and have seen them all dive into it from a Cooper's Hawk. Chickens are way smarter than people give them credit - but it's up to us to add the safety precautions too.
Beautiful photography!