I have been throwing this around in my brain too. But my deal is I ferment feed for my chickens.
I'm assuming you are looking for something for dry feed. What about buckets with pvc pipping running from it to a feeder?
Yeah I use a swimmijg pool right now. Ive been thinking of 5 gallon buckets laying on their side make a door to pour ff in then have multiple squares for them to put theirhead through and eat without stepping in it.
For dry feed the best thing was my dad made a feeder it was awesome. Next time at my dads place ill take.pics and show. It held 50# of feed and could easily be made bigger for 100#. We hasld very minimal waste.