I'm just gonna say that post #20 wins this thread.
Post #20:Notice how the fretboard extends toward the pickups beyond the heel? I'm only aware of third parties such as Warmoth doing that. Any way to get pics of the neck pocket and neck heel? I'm not saying that CS couldn't. Just pointing out that I haven't seen it before.
You know...first I thought that this was possibly a customer requested option. However, I believe that if you were to order a Masterbuilt instrument with 21 frets, they would just build it with a standard heel and matching neck pocket rather than using the overhang trick.
Actually...on closer examination of the pictures...I am fairly certain that this neck does not have the overhang. You can clearly see the maple beneath the rosewood along the bottom.
So...Post #20 is not the winner of the thread after all and the authenticity of the neck is still debatable.
and no overhang visible in this photo either...