Plans call for extending door reinforcement strip to outer edge of plexiglass, then gluing weatherstrip to the door reinforcement strip. This then seals against door frame. Other Series 5 Kitfoxes I have seen have the weatherstrip on the door frame, sealing against the plexiglass. Also: best way to attach plexiglass to door? Rivnuts allow screws that don't penetrate inner tubing of door; any experience of Rivnuts coming loose (minimal torque)?