BTW, as I have become a publisher in recent years I know now what to do, I can maybe help by acting as the publisher for the book. If an author of a group of authors can write a manuscript, I would be happy to fund the production of the book and host the sales of a PDF version (see
http://bit.ly/1iNacG8 for how selling both print and PDF would work).
If money is needed in advance for authors so they can live while writing, we could crowdsource that and repay the investors form the proceeds of the book. When the investment has been paid back, we could distribute the PDF for free or use the proceeds to fund updates and such.