OK, first I am going to send my reviewer's comments to Barnes and Noble

That will set a fire under your butt.
For anyone who might think there was something "fishy" in my review I have a comment. As a prior text author and university professor I have reviewed several textbooks for publishers such as Prentice Hall and similar companies. These reviews are usually contracted before the book is published to address any scholarly, publishing and marketing concerns. The review I posted here is very similar (without a thorough review of content) for what would be written for a publisher. I posted it publically to encourage others and to show how one can tactfully praise and suggest improvements in one review. The idea is to help the author to improve their work. The review is honest but tactful and is of course intended to be helpful.
My hope is that this type of review can be seen as an example when we all review products by other people and thus make AZB a better place for all of us. BTW I note that most of the subsequent posts have been on topic and have also been helpful -- isn't that nice.
Note to Dave, this "second job" could actually do much for pool through making an excellent teaching system available that could affect the lives of many younger people. This could be a very real contribution to the pool world. You obviously have the skills needed to produce excellent materials and the necessary background in the pool world to understand the needs. Perhaps this needs some serious thought. It may not be as sexy as some of your engineering work but there is a real need and a very real potential contribution here.
As you probably know publishing companies often set up a divison for one or more of their product lines. Sometimes an external consultant is used to identify and help guide products to be developed. I think that your works (past and present) could be used to propose such a division to a publisher of your choice. This could be a second job that would be recognized and supported by your university. Again there are many possibilites here. BTW, I have "been there done that" and it is much easier than you might think to get a major publisher who has a track record in a related area to get interested in such a new division. They are always looking for ways to make money. Stick with major publishers as they have the resources (financial and otherwise) to under take a new product line.
Proposing a new division is not much different (just wider) than proposing a textbook. The textbook proposal forms available on many of the academic publisher web sites could be used to propose a new division. Let them take care of personnel, you only need to substantiate, need, content, audience, etc.
The alternative is to propose a company, but then you need financial backers etc. Been down that road too and it is horrible. The sharks in the water far exceed anything found in the pool world.
And for what it is worth, I would help but no major commitment. I am retired and lovin it. If you want more info PM me and I can provide additional details.