This needs to be multiscale. The treble sounds strained and whiny, because it's at too much tension, because it's too long. The bass sounds farty and unfocused, because it's at too little tension, because it's too short. There's a good reason bass guitars are bigger than guitars. Multi-scale guitars have been out of patent for years now. And if the harpejji was invented in 2007, then I believe it should go out of pat…
+1 for multi-scale. While on the topic: I have thrown some hard-earned cash at a multi-scale guitar a couple years ago (a Strandberg), and it both sounds great (well also thanks to craftsmanship), and is much more comfortable to play in the higher positions: the way the frets are fanned, the left hand's wrist remains in a more natural position. It'd be difficult to switch back. I've worked on my own instruments many…
This tapping instrument seems very nice but certainly not bizarre, if you want bizarre, look under a d10 pedal steel. If i were to buy a tapping guitar, I would also look at Markus Reuters, touchguitars.com.