We have very little building experience. We have a coop with no run. Id like to put the coop in the middle of a tall, free standing run. Want it six feet tall with door for us. Chickens will be closed in coop at night, but need run to have owl/hawk protection which should include hardware cloth roof. Ground predators are dogs and raccoons. Do I need a skirt for daytime protection? Want to use sand as flooring. Any special base needed for that? Would like it to be a 8ft square. Any help given would be greatly appreciated. Oh, we get snow so Id like half of the top of the run be a pitched roof.