Well, Chan, if you are serious about using a roller drum, I would suggest that you build the tank to the dimensions you require, then build a platform so that the rollers sit at a depth sufficient to roll the drum through the hot water, just as a Jobo's bath does. If you have seen/used a Jobo, you know that the drum isn't fully immersed in the water. Instead, the machine holds one side of it in the water, and rolls it in this little hot puddle. You could create yourself a little structure like this yourself, suspended above or within a water tank. I'm not doing rotational processing, so I've left this as an exercise for other creative users.
Originally Posted by Chan Tran