As stated in the previous post, the neck had to loose some weight and get a thinner profile to improve playability and action.

First, I made a jig that allowed me to route of most of the wood. This jig has a built in slope, to get a taper towards the headstock. After that, I spent an evening shaping the neck with a spokeshave blade and some rasps and files. The second evening I spent shaping the transitions. I am more or less satisfied with the result, although I think it could have been better if I got it right in the first place.

The neck now measures a little under 21 mm at the first fret and about 23 mm at the 12th. The profile is slightly asymmetrical, being more of a C-shaped profile at the lower half of the neck and more of a D-shaped profile at the upper half of the neck.

Then I tuned it up and found out three things greatly improved:

1. It plays a thousand times better, actually, from awful to very good!
2. The strings bend the neck and the truss rod actually works now, to counteract the tension.
3. The balance is sooo much better, first, it had some serious neck dive issues and now, it balances just fine.

So, call me satisfied!