1. Drilled a baggage door hinge access hole in the firewall, but even after making it a bit oblong, and as high up as possible, the hinge still didn't fit comfortably into the hinge eyelets. I checked the plans carefully to make sure I had everything aligned and the spacers stacked correctly, I did, but there simply was no way the factory plans were going to work. So I solved a problem and perhaps even improved things by cutting out two new spacer strips out of 0.032" scrap aluminum, then drilled and clecoed one of them between the hinge and the C-channel mount. This lowered the hinge a bit, and I could get the pin in. (The other spacer strip will go under the other half of the hinge, in the door.) 2. Test-fit the hinge halves and trimmed some notches in the side door-support strips to allow the hinges to clear as they open and close.