I haven't read all of the recent comments. Have you made progress yet on understanding Yudkowsky's meta-ethics sequence? I hope you let us know if you do (via a top-level post). It seems a bit weird to write a book on it if you don't either understand it yet or haven't disregarded understanding it for the purpose of your book.

Anyway, I appreciate your efforts very much and think that the book will be highly valuable either way.