Steve Wetherill has just created a post with details of Heart of Yesod, including the raw original Q&A that was used to aid producing the write up the GTW book. The design document from 1989 has also been typed up and tidied up, which you can check out at:
https://blog.stevewetherill.com/2022/01/heart-of-yesod-game-that-wasnt.html
Steve’s blog also contains a number of articles about his past work and projects that should definitely be checked out!
