Have you seen the feeders made from PVC pipes? There are many threads and pictures around BYC. What if you used galvanized pipe? You could maybe hook up some sort of open/closed valve down near the bottom - and if the end where the actual feeder is was threaded, you could close the valve, unscrew the feeder, dump any unused feed back into the top and be ready to open it up the next morning. If you also connected your pipe to a larger galvanized trash can, you would have a large volume - rodent proof - (almost) automatic feeder.
Just an idea
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That is a good idea. I am working on designing a pvc feeder that has a close-able feeding trough. Probably either a flip top that covers an open feeding trough, or a slider that covers up feeding holes. I am leaning towards a slider because it would be easier to rig it up so that it could be closed from outside the run...I'll post back if I ever have the time to make it!