I printed off a modified model that addressed some issues and also added the right-end piece for the first time.
The back got a little bit deeper to accommodate a deeper screw hole. While the depth seems about right now, the length of the channel is too short so I can see the model popping off. I’m diving into constraints in Fusion again to try to fix this.
For the right-end piece, I cut a hole for USB-C and then an interior channel for the rest of the board to sit in, as it juts out. I also originally had an interior block in the channel to try to keep the board from moving around, but it seemed to be in the way so I carved it out… but I put all of this in the completely wrong place, so I have to make adjustments and print again anyway.