Go for it cedars. I like you writing style and I'm sure it will be a good read.
I share many of the concerns mentioned about how many people you can reach with this kind of autobiography. Outside the JW world there are just a few who are interested in anything related to the witnesses.
I've thought a lot about it, because I'm although working on an book about my experiences as a jw (in german though). But as already some of my poems and short-stories (not about jw) has been published in print here in germany, my approach is not to write nonfiction, but a novel. In the storie is much jw-stuff involved, but it is not the main thing. So anyone who is interested in a good story may like to read it. But I will put all the stuff that people have to learn about the jw on key-points of the story. So the reader is not just learning about the witnesses during his read, it might allthough (so I hope at least) arrouse more interest about jw and cults in general.
I wish you good luck and most of all (for a writer never knows which reaction he will experience by giving his book to public), much delight during the writing.