You really have a beautiful area that the chickens would love to roam in. Would you be able to build some chicken tunnels just using 2x2 pieces of wood and chicken wire? You could just build them 2 or 3 foot high and zip tie them together when you move them. That way they wouldn’t be too heavy to drag around. You could connect them together and move them around your property. They would just be good coverage for hawks if that’s what you are worried about. Well trained dogs roaming around also would help against the other predators.