Nice looking tank. There is only a need for one SS tank to contain the parkerizing solution. If you are doing barrels/barreled receivers, you can use inexpensive wallpaper troughs for the water rinse and oil treatment afterwards. I've done a lot of parkerizing using a plastic kitty litter type pan for degreasing and another for the oil treatment. A white plastic pail works well for the hot water bath after taking the parts out of the park.