Building A Chicken Coop - Brilliant feed bin idea. No scrapping around or wasted feed on the floor. And the feed stays dry in the rain. - Building a chicken coop does not have to be tricky nor does it have to set you back a ton of scratch.
Nice idea to keep your horse busy - particulary during boring stall times. Birchbark is also a healthy support for change of coat. I don't use stalls, but could be fun for the pasture/run in shelter. Or if a horse needs to be in the stall for laminitis