I am building an 8x10 coop for 10 birds. I am thinking of building an above ground run 8' x 20' x 2'high. Top enclosed to hamper hawks. Bottom to be some wire mesh that is predator proof and kind to chickens feet. Chickens to have auto access to this run via electric door opener. Would hardware mesh be a good solution for bottom? Frequently we will let birds access a fenced in grassy area protected by electronet fencing by Premier.We have lots of acreage so we may rotate this grassy ranging area on a regular basis to avoid bare earth, muddy run situation. The ground is very hard and dry and full of rock shards. Digging post holes with clam shell digger is going to be a horrible job Any comments or suggestions much appreciated.