I've never seen anything like this before but looks interesting nonetheless.  
 
http://www.ebay.com/itm/221690172619?ssPageName=STRK%3AMEBIDX%3AIT&fromMakeTrack=true

Certainly 'thinking outside of the box' with that design.

I'm just guessing here, but I would imagine that the back of the neck might be just a little bit uncomfortable, what with sliding the palm of your hand, and especially the fleshy part between the thumb and first finger, back and forth over a set of guitar strings.  Having the controls mounted where they dig into your leg while sitting also looks a bit uncomfortable.  For the application shown in the video, playing bass and guitar parts through a looper, a double neck instrument would seem to make more sense.

Not to mention the controls (and jacks) are sitting just over the place one would rest his arms, smart... not.
 
(Message edited by mario farufyno on February 16, 2015)

It's not a C neck,  
it' not a D neck,
it's an H neck!
 
Bill, tgo