Thanks again for this great idea! I plan on doing a couple of these soon, and got to thinking.

Would it be feasible to cut out a hole in the side wire, just big enough for a food hopper (such as the ones they sell for rabbit hutches) to fit in? That way someone little like me could refill food without unstacking or opening tubs, and the rats wouldn't be able to scatter it like from bowls. (Well, they would, just not as quickly, LOL)

Also, to the person securing the wire with bolts, please post pictures!