What makes these hard is that they are very long. To make this easier align it on one end and tack down just one single pin, you can still rotate it quite a bit. Go to the other side, align, tack down a pin and you are good to go with just drag soldering along the whole thing.
The project is now uploaded to https://hackaday.io/project/175832-minimal-raspberry-pi-cm-4-carrier
and the PCB files to https://github.com/PTS93/Minimal-RPi-CM-4-Carrier
Please keep in mind this is nothing but a quick and dirty demonstration. Especially the routing is far from good and completely optimized for CNC milling, nothing you wanna copy
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!