I've got no personal experience with DWC; I'd look to the logs of XCrispi and Weedhound for insight.

One thing to remember is that using rubbermaid tubs for a reservoir, you may find you need to support the tub in some way, such as an exoskeleton of 2x4s bolted together, so it does not collapse under the weight of the water. Once you get into large volumes this becomes a problem.