Thanks for bringing this topic to wider audience. Even some most seasoned guitarists have very limited knowledge about different string instruments. It's always good to listen music which is played with unconventional instruments.

One thing I have noticed is that fan fretted guitars are coming to main stream. They have been making their debut for quite some time, but now there seems to be some models even on big guitar makers like Ibanez and Dean. 6+ string guitars are also more popular than ever.

Three of my favorite ground braking guitar builders:
https://strandbergguitars.com/

• Stainberg style guitars, but alot advanced building techniques and hardware.
  https://www.facebook.com/oniguitars/
• Look at the frets. LOOK AT THEM!
  http://emeraldguitars.com/
  Acoustics with carbon fiber, extra bass strings and fanned frets. Check out their customs.

This guy has probably no need for bass player. Ever.
https://www.facebook.com/natelopezmusic/videos/10153246099911689/?fref=gs