Here's my recently finished prototype control panel built mostly from parts I had laying around. There are a lot of upgrades I want to make for the final panel (twist lock receps, center off switches, larger enclosure, etc.), but this is what time and money currently allow, and using this should help me to refine the final design. The controllers are similar to the ones in the e-bay aquarium temp controller thread, but single stage, fahrenheit display, and SS temp probe (and cheaper). It's not nearly as well constructed or fancy as most of the ones I see here, but I think it's a nice addition to my ghetto HERMS, and it only cost me ~$45 out of pocket.