Sweet rack! I am debating building one..
It would be Awesome to have a self-watering system.. changing water bottles is a pain in the arse. Tim was very helpful to me too in my incubator building quest, and Rich at RB can't be beat.
Congrats for finding a use for FS buckets; I try using them to haul horse water in the winter, and when I set them down, the handle drops way down into the snow! The taller square buckets work better, but those ones are great for cat food :)