I noted that the wing intersection fairing didn't sit tight to the fuselage where it overlapped the lower fuselage skin. This meant that the rubber sealing strip wasn't pressed against the fuselage, and it seemed that it would come loose.

I decided to add an additional screw going into a nut plate on the portion of the lower fuselage skin that stuck out from the fuselage, right next to the fuselage side. This held the wing intersection fairing tightly in place, ensuring that the rubber sealing strip would be secure.