Think about a deep tank system. A set of 3 gallon tanks will take a whole cage full of stainless reels, at least a dozen at a time, and the dev tank can be put into immediate re-use.(posted 8460 days ago)
IMHO a rotary drum system has a worse throughput than hand souping in small SS tanks, due to the drying time of the reels. The one drawback is that a tank line needs a broom cupboard sized darkroom, a changing bag won't do.