Oh my! Well, I appreciate the plug on those lessons. Here are some links to those. Your concern is noted, and perhaps some more lessons will surface in this style. Agreed, taking the guitar outside of it's normal context is always a lot of fun. Enjoy!

New Age Acoustic Guitar Techniques

Many of these lessons explore that concept but in a pretty technical way. Are you looking for more effect driven stuff or just using parts of the guitar to make sound with no real harmonic value?