I have a 4' tall A-frame chicken tractor that I wanted to make a PVC feeder for. There are 5 chickens. Is it possible to make a PVC feeder for a tractor? What configurations would I use? I read about using 4" PVC pipe and 45 degree elbow but when I put these together it seems not angeled enough. And can a 3" pipe be used instead of 4"? Also, how many openings should be drilled w/ 5 chickens? Thanks!