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I don't think it makes much difference, to the chickens or the predators. The predators already know the chickens are there (smell, sound, and seeing them in the daytime.) The chickens know the predators are there (sound, and maybe seeing them in the daytime. Chickens don't see well in the dark...

I think that will mostly work. Chickens will not be bothered by having wind beneath their toes: they tend to like sleeping in trees, if given a chance. If you do build the floor, and you shut the birds into that enclosed area ("coop") at night, the floor will help protect them from predators...