All my fixed neck guitars, classical and steel string, feature a neck that can be detached by unscrewing just four bolts from inside the guitar. Bolted necks are nothing new for electric guitars; Leo was doing it in the 50’s. However, having a detachable, bolted neck on an acoustic guitar which is easy to adjust for angle (if it ever needs it), with solid wood beneath the fretboard from the nut to the 18th fret, with a truss rod that is adjustable via the sound hole (so the headstock isn’t weakened) is certainly rare, if not unique. One reason for this innovation is that I hate dressing frets, especially the very hard frets that I use. Building necks this way means I can fret with such precision that I very rarely need to fret dress and the plane of the top of the frets remains very stable over time. This benefits both the playability and longevity of the guitar.