I hadn’t previously drilled the holes through the cabin top sills into the side decks and longerons.
I 3d printed a drill guide overnight. The drill guide wasn’t necessary but it made for clean, perpendicular holes and was probably faster than measuring.
![](https://airplane.allanglen.com/wp-content/uploads/2022/09/pxl_20220907_1338424753098078249495481328.jpg)
![](https://airplane.allanglen.com/wp-content/uploads/2022/09/pxl_20220907_1401574334393885040943710158.jpg)