Rich:
Please let me know where to go for the lab style tubs. I already know of one place. It is at pythonsdirect.tripod.com/index.html
I wouldn't mind getting some more sources for tubs. I think that using tubs for rats would be probably just as good as a rack system. I know that the tubs come with a watering bottle that will last for days or weeks.
As far as how I clean the cages of my rats when there are pinkies, I don't do anything special. Here are two equally good ways: 1) I just prepare a new tank and put newspaper in the new tank and move the mom and babes there. My rats don't seem to eat their young even when the babies are handled on the first day of birth. 2) when I don't have clean tanks already available, I just move mom and babies to a temporary container. I then clean the tank and lay newspaper and put the babies back. In the new tank, I don't do anything special. I just put the babies directly on the whole, intact sheets of newspaper. The moms then will tear up the newspaper and move the babies under the torn pieces. Rats are good moms.
Mice are a little more persnicketty. For them, I would wait until the babies are at least 24 hours if not longer before moving them. It is a good idea to disturb mice with pinkies as little as possible.
Hey: by the way, thanks for sharing your personal experience with pellets and vanilla extract. Also, thx for sharing your seven day cleaning cycle. It is good to read about personal experience and good endorsements of the pellets and vanilla combination. I am in the process of considering possibly maybe going that route. I currently use newspaper and I would like something more sanitary and pleasing to the eye and nose. So, see, even though you are new to breeding, your sharing of your experience is helping people like me already.
Hey, even though you are new, you have already taught me something. Your endorsement of the pellets and vanilla extract and your seven day cleaning cycle is something that I may adapt in my own home. Additionally, I may also start using the lab style tubs. Please give me some places in addition to python direct. I'll also look for them at the MARS reptile show which is in two days.
Hope to hear from you in the future and maybe we can all learn from each other in this big tent well call Kingsnake! 
sincerley.
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Longtang. I like snakes and rats.