maybe post the ingrediants like the protein fat and fiber percentages so you can get better feedback

the dog food everone seems to recommend is senior dog food because of the low protein content

Edit: the runners for the lip of the tubs look a little far apart, you might have an issue with sliding the tubs when there full of rats and them slipping off... thats exactly what happened to mine, i just recut the front and back pieces to make the tubs fit nice.

I left about 1/16" on each side between the tub lip and the upright piece of wood