Not a real progress, but the replacement maple neck arrived. Very prompt service. So fitting it onto the body looks like this
Now curiosity got to me so I had the two necks side by side.
The maple neck appear to have a longer section ahead of the truss rod hole. I also found that the maple one appear to be much smoother already. Nice little surprise as the neck is 22 frets (same with the rosewood, I just didn’t realize it at the time)
Experienced builders - do you normally sand the neck as well? It seems quite smooth already. If you do, do you hand sand the neck as it has a curved surface? What about the fretboard itself?
I’m planning on finishing the neck with dingotone acacia front and back. Leave the finishing coat off the fretboard as DB suggests, and put the dingo wax on the fretboard.