OK so starting our coop this weekend and I want to make it last for a long time. Right now we will have 6 layers in it but I'd like to make sure is can be OK for up to say 20. The little building is 7'x 4.5'x 6' high. The run will be the same width but around 30-35' long. Will that be enough? Everything is going to be stripped new and rebuilt from the existing posts of the little building. Another question is does anyone have any last minute advice on predators? Out here we have coyotes, opposums, raccoons, stray dogs and cats and goodness knows what else. I won't be able to handle something getting at my babies.