The problem is that you cannot learn alchemy from a book. You need an oral transmission, as I have explained elsewhere. The mental body is hungry for words, but the food doesn’t get digested at the jing level.
I haven’t rushed a book out because it is a deep topic and requires time for things to mature. I ‘d rather write one decent book than ten half baked ones.
But the introductory lectures from each course are coming next, and will give you plenty to chew on.