The thing that makes this project so special is that the reader will be able to assemble a low temperature differential (LTD) Stirling Engine that will run from the heat of the hand, and the project can be completed with common hand and power tools. A machine shop is not required.
These engines run with a 20 degree temperature differential. That means that if your hand is 90 degrees or warmer, and the room is 70 or below, the engine will work from the heat of your hand. They also have very impressive performance in direct sunlight.
I am not sure if I still have a publication deal for the book or not. My long break from writing may make it necessary for me to find another publisher. One way or the other I hope to get this information out there for the Stirling Engine community to enjoy.
I want to thank all those who have been enjoying and commenting on the YouTube videos. I have had the chance to help out a few builders and answer some interesting questions as a result of those videos.