on my last day in Niigata I asked the host mother there if I could help out with her tofu making group. she and some of the other ladies in town make tofu at the local onsen. she asked the other ladies if it was alright, and after some initial hesitation I got the green light.
sadly, I had to leave before the firm tofu could be packaged. but I got a general idea of what happens next. Also, the leftover dough like part of the soybeans are used for various cooking techniques as well as organic fertilizer.