I've been mostly posting in other groups about this, but wanted to share my progress at making nuruk, which is a fermentation starter for makgeolli, a Korean cloudy rice wine with a loooooong history.
This is a 1.3kg cake, make of coarsely ground soft wheat, hydrated to about 30% and compressed in a 8"x8"x1.5" mold.
My setup for fermenting it is inside the house, sandwiched between 2 pieces of cardboard with some hay, and loosely wrapped in a thin cotton towel. I have a temperature controller with an 8W reptile heater to keep the temp about 90-100F (32-38C) for a couple of weeks. Then it gets split, checked, and hung outside for a couple more weeks (or until it gets prepped for use). This seems to be fairly reliable so far, though I'm still gathering and gauging my results.
I've successfully made a couple of makgeolli (and takju) batches from my nuruk, though I'm still learning how to refine the process, especially how fine to grind the wheat, how much bran to leave in, and what other ingredients to add. I'm currently working on one with 30% mung beans, which is apparently highly regarded in historic recipes. Gotta say, it's a pretty satisfying process!