After more than 30 years as a university professor, I started making native american-style stave drums by recycling wooden pallets. I sold them at arts & crafts shows for a few years, and, when the forty-eleventh person asked me how to make them, I wrote an e-book. Then I wrote one on making gourd drums, another on tongue drums, and still another on thumb pianos -- all of which I had made and sold. They've been pretty popular, and readers report they've had success in building a working instrument.
You can get more information about my e-books here --
http://highenergydrums.com -- where you can also download chapter samples without cost. The books are in PDF format, so you'll need a PDF reader. Most people use Adobe, but Foxit has a free reader that loads quicker than Adobe's.
I welcome feedback on my books, website, whatever.