Gil
I have a 36 inch tube that is plugged onj one end and holds a modified ED's Red that is 50/50 acetone and ATF. I see a fellow recomending no ATF, he does not understand what ATF does, it is a detergent, a high quality oil, and a surfacent. This last item is a wetting agent. It makes a big increase in how fast the brew works. I have been using it on my skeet tubes for ten years soaking them a few days before a match. The stuff that comes out of those tubes is unbleavable. I also use it to soak parts, DO NOT use it around plastic!
The tub is stainless and is built to stand. I use a turned plug of maple to make the top.

Bill