Thanks for all of the comments and compliments everyone. This is yet another project that takes a while to complete, but it is always worthwhile when it is finished.
It is always a concern that outside rodents get to the food. However, I have spent alot of time trying my best to ensure that there are no routes of entry for them to get in. As for storing food in bins, I would love to do that, but we order about 1200 lbs of rodent food every 6 weeks, and we are ramping up the colony soon, which may equate to an additional 50lbs a week needed. I would have barrels stacked up everywhere. It is much more space efficient to stack it like it is delivered, on a pallet.