Since the outside skin doesn’t fit some fixes were required for the front inside skins.
Two rivets were left out because the rear skin overlaps here:
Countersink rivets were needed, I didn’t have any blindrivets so I used solid rivets:
Next was enlarging the cut-out at the front that conflicted with the u-channel of the firewall:
Next was trimming the rear side that conflicted with the upright channel of the main spar carry through. This was done with a steel angle and the cutoff disk in the Dremel followed by cleaning up with a file and sandpaper:
Another relief cut for the side rails:
Due to some scratches and these fixes a touch-up with dark-grey paint was needed: