I've seen pics on here of wooden feeders people have made to go in their coop. I've seen some with like a little window to see how much food is left in there, etc. How big does it need to be to hold a certain amount of feed? I use layer pellets. Does anyone that has these have pics they could post here or a link to pic? Pros & cons of these type feeders? Any issues with rodents & such? How high off the floor of the coop would the feeder need to be to keep from getting shavings & such in it? Thanks!