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Not many things can burrow through cinderblocks, I wouldn't worry about burrowing with cinderblocks for the coop floor. Cover with sand for bedding. As for the run, a deep hardware cloth layer 6 - 8 inches down and covered with dirt will be good for predators.

Cinderblocks or gravel and sand could be used for the floor and foundation. Will this be just the coop or the entire area?

The metal shed isn't a bad idea, as long as you really up the ventilation and put it in the shade.