Here is a pic of my feeder made from scrap 2x4s and rain guttering..yes, it's got a coating inside that keeps the feed from coming in contact with the metals. My hens do not get inside this or scratch but if they did, it is very easily overlaid with wire to prevent this. Drill a hole or two and zip tie on a wire cap...done. The wood feet keep it at a good height that prevents climbing inside but allows the standard bird to stand easily and eat at chest height. Coupla boards, coupla screws and you are in business! I've even drilled holes in the bottom of this feeder to allow excess fluids to drain off the feed.

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