Trimmed some more, filled some holes with bits of foam and urethane bond. Enlarged Map Pocket hole, and filled the other end with foam.
Assembled right rear fixed armrest core with urethane bond, clamped with drywall screws.
Removed right Aileron torque tubes. Hot glue together the 14 surviving bits of rear armrest flange form with 2 more bits, tape, and hot glue to fuselage. Immediately note it is on the wrong side... Manage to get it off in one bit and refit properly. Check carefully to ensure this bit matches the left side... Because I checked it was fine.