It sounds like he was not only good friend by a very knowledgeable person. Obviously, you are aware models we have never seen or heard about. It is great that someone with your interest and knowledge would write a book covering the subject. That will be important to those that follow us and allow them the benefit of your knowledge. Think how different it would be, if we did not have the books and printed records left by others. Obviously you have spent a great deal of time researching the subject and it should be an interesting book. Thanks for keeping us informed.