Kimchi, Kefir, Sauerkraut and all other fermented foods

Just winged it with a few pointers from @Mr_Sworld and someone in the AQA thread. I took the internal thermostat out completely and short-circuited where it use to be on the relay, only because taking it out means I can fit 3x ikea Samla boxes inside quite neatly, each of which hold 2x oval bannetons (not that my mixer could probably handle that much dough at once!)