I use casters on most of my racks also, it makes cleaning around the racks much much easier.
The auto water spigots will be in the way of the tub being pulled out all of the way.
If you cut off about 4 inches of the front of the railings that hold up the tubs then the tubs will be able to slide out and not be blocked by the water spigot
Most of your ratties are weaned now, I have 4-5 females that are 3 weeks old that will be ready this weekend when you come this way
I'll shoot you some pics of them after the kids go to bed
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