Maybe I am a bit too harsh on the “George” revisionism claim regarding Rinzler, but apparently that modified “midichlorian” quote is around page 398 of the Making of Star Wars book.

Yeah, actually I think what you said is exactly on point. Rinzler mentions in that interview that he had actually finished the manuscript, and that there really wasn’t anything “juicy” in it per se. He said he felt if it was ever released, fans would probably be disappointed. But he thinks the reason it was cancelled was because Lucasfilm didn’t want to bring back up certain things from production, things that the public already knows, like Lucas saying they didn’t use his treatments, Brad Bird being in talks to direct early on, Harrison Ford’s injury (which Rinzler describes as “Harrison almost dying”). Like you said, it might be a long time before we get any official Behind the Scenes book outside of the Art of books, I would say at the earliest 10 years from now, if not longer.

That’s why I think it would be really interesting for a fan-made book were to be made that would compile as much known information regarding the development as possible. Sources like books, interviews, blogs, behind the scenes videos, etc. But something in the vein of Secret History might be the only “making of” book we might get for a very long time.