Cool! I've been making sourdough for about a year and do a similar recipe on a larger scale. Have you read about the benefits of soaking grains to reduce phytic acid? I have a post all about it here:
https://steemit.com/fermented/@bthebest7/how-to-properly-prepare-grains-for-optimal-nutrient-availability-absorption-pancakes-recipe
I'm a friend of Rob's I saw your hempcrete project. I have a sister in Mayerthorpe that is into all this stuff as well, we visited Rob last summer, would be cool tobring more ppl together in the area!