Glasshen, with regard to the fence, that will keep most of the "bad guys" out, but opossum and raccoon will have no issue scaling that. Although they are primarily nocturnal, I often see them in daylight hours. Just some food for thought. There is no such thing as a predator-proof environment...only predator-resistant. Eventually, a well motivated predator will find a way in. The goal is to make it not worth the effort.
