@igorsMistress
i think i saw one of those treadles on youtube, i would love to know how you design it, with our 360 cage the only birds that get in are the mini winter birds that have come once again and they just leave their droppings all over any other bigger birds than that and the roosters growl at them when they pass by, but they can't get in anyhow but those little ones, in the water, in the food dish, but since i got this new one they tend to perch on the side and not go inside of the dish so the droppings stay out of the food for the most part now...
You might want to check out this thread about them:
https://www.backyardchickens.com/articles/building-a-treadle-chicken-feeder.47900/