When the seatback panels had fully cured I trimmed the excess material from the top edges.
This took a while but was a straightforward exercise. I mainly used the block plane, with a chisel to trim the ends where there was no room for the plane.
Here is the starboard seatback in the process of being trimmed.
And this is the same seatback finished.
You can see that there is a narrow gap at the front of the seatback panel where it meets the rear cabin wall.
It looks like the panel is about 1cm too short, but I have no idea why! The cabin wall and the transom are in their correct positions, so I just put it down to yet another PocketShip eccentricity.
The port panel is exactly the same. It doesn't matter in the slightest - the panels land securely on the wide cleats that I fitted on the cabin wall, and the small gap will be filled by the fillets.
Finally, here is a view of the trimmed starboard seatback from the front of the boat.
It's nice to see the cockpit looking a bit more three dimensional!