Guy Plays 'Dueling Banjos' Solo On Double Necked Guitar

For most people a double neck acoustic is a truly exotic beast and this is down to their rarity, complexity, difficulty to play and ultimately their huge cost. The more I looked at this Dean Double Neck Guitar Sale
  the more convinced I was that Carbon fibre was the ultimate material to build a bouble neck guitar from and that we could build something that could make the double neck much more accesible and even functional.

The two open humbucker pickups in the SDN-01 body for the guitar, and the two covered single-coil pickups for the bass, give you the room to explore your sound. The 3-way double neck guitar
  pickup switch next to the Volume and Tone controls lets you adjust the pickup pattern to achieve your unique tone. "A completely new and exciting instrument … combines the conventional six-string guitar neck with a twelve-string neck—six strings double strung which can be tuned either in thirds or an octave apart for reinforced resonance and unusual tonal effects." — Gibson catalog, circa 1962