looks good man!!
my only suggestion is that you upgrade to automatic watering. once i did i will never go back. it saves so much time. i only have to add water to my 5 gallon bucket once a week and it supports 5 tubs with 1.3-1.4 rats and their offspring. if it was bottles i would have to fill at least twice a day. it is pricey up front but pays for itself in no time.
i bought a horse watering bucket from tractor supply that had a flat side for attaching to a fence post. its a shorter odd shaped bucket but the flat side is better for attaching the water output to it.
adam jeffery