I have a 7-string fretless Curbow XT-33 and the following problem: I NEVER play above the 24th fret on this 33-fret instrument because good intonation is impossible (for me, anyway) in that register. So one of the main features of the bass is going to waste. It is difficult to play while seated because of the cutaway and I'm not even playing up there! I am considering a conversion to fretted to enable use of the upper registers, but 1) I am unsure of whether or not rockwood is difficult to work with, and 2) This is a GREAT sounding fretless. I can't get a response from Greg Curbow. BTW, there doesn't seem to BE a fretboard (rockwood is very hard). Yes, you play directly on the neck. I live near Seattle and hear the renowned Mike Lull can do ANYTHING with an instrument. Any thoughts/experiences with conversions/Curbow/Mike Lull?