I had 30 barrels yesterday, as of right now I got nine left.
Scott, to address your questions. In my opinion there is no problem with sitting this on a cement floor and letting it go. However, if there was water or something like that, I can see where some concern would be in order. However, to fix that there are different things you can do. Greg just cut off the top of a plastic barrel and then took the bottom half and set the SS barrel in the bottom half of the plastic tub, put the water in and let'er rip. If you wanted to you could use the whole plastic barrel with just enough sticking up to put your positive connection.
Then you can use steel rods laying across the top and the pieces to be cleaned, hanging down from the steel rods in whatever way you wanted to make it work. On the steel rods, take a piece of garden hose and slip it over the rod, leaving a place in the middle where your piece will hang down, and then leave a piece bare on the end, so to have your negative connection. And you're good ot go. The beauty of this is that the entire piece to be cleaned is getting cleaned from every angle.
When you use a plastic barrel with a piece of cast iron in it and a piece of SS (anode) or whatever you prefer to use as an anode, the problem is, you can only clean one area at a time because the piece to be cleaned has to be facing the anode. With the barrel, the piece to be cleaned is facing the anode on all sides from every direction, you could argue its not getting it at the top, but that little part is so small and in reality it cleans there too because you got the juice going there too. Anyway, thats my take on it and these barrels are the hot tip.