If you've got a Battery Charger and a box of Washing Soda, you can do it.
I haven't done it yet, but I plan to. I have to find a plastic tray long enough for barrels. I'll use a piece of U shaped steel from the scrapyard for the piece that collects the rust. I'll then make wood blocks to suspend the tubes inside the flanges of the angle iron, so rust is removed on three sides at once. Rotating the tubes will be easy with the blocks.
From my experience, you seem to making this too complicated.
I use a plastic tub I bought at Lowes. I hang the barrels with string or rubber tubing (old bike inner tubes) from dowels across the top.
I use whatever wire I have. Wrap the wire around the lugs or even the barrel itself.
For an anode, I use the lid off a 1 gallon tomato sauce can (For increased surface area) when doing a group of parts like the revolver.
For barrels I use a piece of all thread lying on the bottom parallel to the barrel(s). Have never had to turn or rotate any parts.
I have another barrel to do, so the tank is still on my back deck. I'll post a couple of pictures, even though the internet has many.
