With the help of my wing crew, I attached the port wing so that I could get a bunch of stuff dialed in. My Magnetometer, OAT, Nav/landing lites and the heated pitot tube are all on that wing. I installed a wing root electrical disconnect connector there so if/when I need to take the wing off, I can do it without cutting wires. Happy to report that all those parts worked as advertised and the G3X was all green checks except for the Rotax FADEC. Started troubleshooting what the problem was with that interface and finally found it: me. Didn't quite understand how the interface worked between the Start Power switch and the Lanes. Once I got that straight, Lane A wasn't responsive or at least the light wasn't working. Turns out Lane A was fine (G3X made that easy to determine once I knew what to look for), I had just wired the LED backwards. Got that all dialed in now. Decided it was time to start work on the oil access door on the upper cowling. Made a pattern for the inside dimensions of the opening. Taped that to the rough door and made sure that the door followed the contour of the cowl. Sprayed a little black paint on the door with the pattern attached so I now had a shape to cut to. Cut out the door opening on the cowl and did the final fitting of the door to the opening. Still have to make the cutout for the hinge.