Since I don't have a drum sander or thicknesser, I used a router sled to take off the excess wood, from about 28mm to 19mm. This took three passes in all.


I had to keep checking with a level beam that it is flat.

I also thicknessed the fretboard to 6mm. I need to get a combined thickness of 25mm.

I check that there are no gaps in between. Both pieces are totally flat.