Good lookin' Bill! There is definitely a learning curve in rack building. My latest racks (rat rack v 3.0) are better than my previous ones, and took half the time to build. I have a mouse rack that is similar to those in that the hoppers are seperated for each individual tub. It is nice for filling the hoppers, but when the food gets low, the more ambitious mice will push all the food over to the adjacient tubs, so be sure to keep 'em topped off!

-Evan