That is a really good idea for the work top on your rack. Who makes the 40qt tubs? Not that it matters, I'm stuck with using what I can order 'cause I got no time to do what I need to do now, much less trying to find time to build racks! I'd bet it feels pretty satisfying to be using something you built yourself, huh?
Yes it does feel accomplishing to use a rack you built that actually works! LOL As for the tubs they are bought at walmart. They are sterilite tubs. They are just a bit shorter then the 41qts and seem a little taller but never really took the time to measure to see.