After having my thermostat give up on what was almost a free Lee Production Pot, I started looking at some of the PID projects done on here. Needless to say, I was sold; after all, why just go back to the original design, when you can install an upgrade, which can then be swapped to other pots as you upgrade furnaces?
The parts are from Auber, the 1/32 DIN PID, 25 AMP relay, and K style thermocouple. I put the parts on, and in, a PC power supply case; the power supply actually almost fit the PID, just had to grind about .020-.030 off one side of the ventilation grill after cutting out a section. After that, the PID snapped in place and doesn't wiggle.
The pics were taken after I tested it, and had it "learn". I now have to move everything back out to my garage, so not all wires are there, but the general idea is in place.