I did the same thing. I studied it over and applied it best to my situation. I came up with this. It's a two vessel system with a 52 qt cooler mash tun. Not RIMS or HERMS. Maybe someday, but not for now. Mine is 120v as of now. I will be putting in a 50amp 220v circuit this summer. I built it with this is mind, so it will just be a matter of changing the pigtail, and swapping a couple wires around in the panel and throwing the 220v elements in. Half of work, tops. You can see the temporary wet switches sitting in the shot glass for a test run. They have since been moved to my kettles.