Thank you all for the suggestions. I have seen the bulk grain storage units at the breweries I service, and the dedicated trailer with an auger is awesom! However, the size of my operation does not justify the cost of those fine ideas. The over riding principle of this plan is to keep the cost at rock bottom, so make do with the equipment I have, even if it means I have to shovel it in, although I dont think it will come to that.
So mabe I am making the moisture issue worse by sealing every thing tightly? I think I will do as recomended, and keep a barrel each of the Human food seperate, treating it special, and then see if I have any mold problems in the animal grain. I think I will still purge the bulk bins with gas regularly, and keep a de-humidifyer in the shed. If in practice ,I find I have overcome the moisture issue, then I might dispense with the seperate food barrels in the future. I understand that wheat can keep 25-30 years if treated properly, I am only aiming for 3-5 years max.
I have not finalized the actual recipies of the various animal feeds, which I of course will do before actual construction. Right now I an just trying to nail down all the physical factors that will effect the design.
Also, I have made arangements with one of my customers, a produce market, and I bring home 3 barrels of produce cuttings a week, and I have over 100 resturant customers to pick from that I could collect scraps from. I figured if I needed something more high protein, I could probably locate it for free. All of these low cost, high labor sources of feed will hopfully make this operation cost efective.
I will mill the lumber for the shed myself. I still have to buy defect plywood, craigslist roofing, and weld the hardware. The steel exterior door will come from the Rebuilding Center, and the FRP is left over from an insurance claim (another story). Perhaps you are getting the sense of my financial goals
Thank you all for the responses, I really do appreciate them.