Today I managed to thickness down the headstock to the correct thickness of 15mm. I used a router sled for this. I then drilled the truss rod access hole and glued up the fingerboard.
And I'm not sure why I've been such a muddle-head these few days. You would think I would learn from mistakes but I stupidly made some unforgivable mistakes. My truss rod channel was 1mm off centre at the headstock. I don't think 1mm will make a significant difference but it's just little errors like this that make me disappointed in myself.And I thought I had measured, measured, cut.
Another stupid blunder was during the fretboard glue up. In the midst of all the adrenaline in trying to spread the glue as quickly as possible and scrambling to get everything lined up and clamped, I forgot to remove the masking tape I put over the truss rod channel. While this shouldn't be a problem (People used to do it back in the days. Ben Crowe from Crimson Guitars deliberately did it before.), I was shocked at how I missed it out.
I guess I had an off-day or even an off-week. Hopefully I'll slow things down next week and make sure things are perfect.
On the bright side I think I had even glue squeeze out and no gaps. Hopefully I won't get a surprise tomorrow!