Having never built cables before this was definitely a new experience. They were certainly a lot more fiddly than soldering a board but come the 4th cable I had developed something of a technique that made it significantly easier and so much faster. Soldering the USB ends was totally painless, the only part that caused any struggle was the leftover solder in the Lemo connectors making it difficult to fit the cables in. After a length cleaning process though I managed to get the old solder out and from then on it was smooth sailing.
With all the cables soldered up and tested all that was left to do was heat-shrink them and make them look pretty for pictures, or so I thought. Once I had finished with the heat-shrink I found that the USB C end would press into the housing instead of plugging into the PCB so I had to go back through them all and fill them with a little hot glue to properly finish the cables off.