I needed to build more snakes but this time with XLR fanouts. I mentioned in my previous post that I was going to try using pigtail connectors instead of the breakout boards. I purchased a bunch of pigtails from ebay for about a buck apiece. The ones I selected have all the appearances of being shielded. However they are not. The cable has a foil shield but it is not electrically connected to the jack or plug. The solution was to solder a wire directly to the metal outer shell on the jack and then tie this to all the grounds of the XLR connectors.
The boxes for this batch were made on a laser cutter instead of using electrical junction boxes. They have all the right sized holes in the right places and they look much nicer. It is not required to mount the end in a box but it does add a layer of protection and improves handling.