It doesn't look like the temperature is going to warm enough to drill the rear window until next year so I've circled back to continue the Section 42NiS installation of the Garmin G3X touch display. The instrument panels are backordered and Van's reported that as o 9/1, they are "overdue." Yeah, no kidding. I didn't do a lot -- didn't have time because of grandparent duty -- but I match drilled F-00063 flange doubler, countersunk the appropriate rivet holes and clecoed the nutplates on. But riveting will have to wait.