You know there's a whole subforum devoted to harp guitars (which is what that is), even though it doesn't get a lot of traffic. These sorts of guitars have actually been around for hundreds of years. (And shout out to the carbon fiber forum, since it's an Emerald!) A harp guitar would be super cool to have, although I don't think I could dedicate the time to learning how to actually take advantage of it.
Here's a Gibson "Style U" guitar from 1911. It just has the bass strings, as is common. The Emerald also has a treble course.
