Fitting the neck pocket

As described earlier, I wanted to make the size of the neck pocket smaller, in order to reduce the gap between neck and body.
As I wanted to stick with Ash, but wasn't sure if I could get a piece together into shape that'd be precisely enough shaped to fit tightly, I decided to go with several layers of ash veneer, glued together.

While looking into this, I also decided that the edges of the neck (where it goes into the neck pocket) were rounded off too much as this would once again leave to much room in the corners.

So I would not only need to fill in the neck pocket but also take some millimeters off of the neck to get more of a straight edge (thus needing more layers of ash veneer to fill in that additional distance as well).

Initially, I tried to use a file to modify the neck, but as maple wood is really hard, and I couldn't get the angles right, I quickly stopped that attempt and made a template to use a hand router for this.
I'm quite happy with the result:

So now that I have the final size of the neck, I could mark the body for the final required fill, and continue on that task:

I cut the layers of veneer roughly into shape, glued them together, and sanded them into shape, making sure that the edges would still be straight and not slanted, and that they were all parallel and would fit nicely into the neck pocket.

I wanted the top surface to pick up the direction of the grain of the wood of the body, so once I got the glued-together piece into shape, I sanded it down a bit more to glue on a layer of veneer on top.

For now, I'm happy with the result. Some more sanding of the surface will be needed, but that will only happen as part of preparing for the finish.