I finally had the time to sand - unrelated note: with the famous song "I'm still s(t)anding" in my head - and now I was able to make the bridge and the neck fit. The neck fit is not too tight, but also not very loose. I'm still kind of worried that i got carried away by the song and sanded a bit too much.
I also glued in the piece that came off using CA, thanks! Apparently a small piece went missing, but I'll have to live with that.
When I put in the neck and two strings there were a few things I immediately noticed:
1) The string action seems to be very high, even though the bridge posts are screwed in all the way already
2) the low E-string is veeeery close to the edge of the neck, that becomes even more apparent in the picture with both E strings attached
3) the plastic neck humbucker ring doesn't fit into the cavity, because the neck is in the way. In the picture I've somehow pushed it in, but you can see that the humbucker cavity and the plastic part are not well aligned.
I still have to measure the scale length to see how that fits.
For 1) I guess I have to measure the angle and the scale length, and then decide on whether or not I need something to shim the neck?
I don't really have any ideas on how to correct 2) except for redrilling the bridge post holes, which I'd prefer to not do... Do you have any other ideas?
I've seen problem 3) in the other EX thread https://www.buildyourownguitar.com.a...ead.php?t=9684. They tackled the problem by filing/sanding the neck/fretboard. I think I might follow their approach here.