I am not sure what the climate is like where you live, but I am on the Oregon Coast,. Here we do not seem to have mice like I did in California, here we have giant Norwegian Rats! I HATE them and our barn cats wont touch them, but that is beside the point. Here we have found that if you can get your hands on old chest freezers for storage of feed, the feed stays dry, and the rats stay out! Maybe that will help with storing large amounts of food for the number of birds you want. We use them in our horse barn and our chicken/rabbit area. I have 43 birds currently and this holds their feed, bedding and hay for the bunnies just fine. Congratulations on your upcoming move!
Pellet gun with a night camera through the scope = AWESOME!!!