Why? It's not as close to the chainstay as the photo appears to show. I never found a lockring tool so I'm not going to bother putting the chain on until I know it will fly.
Because they're designed to have one, you'll have 2.5mm excess axle going into the NDS crank and slightly asymmetric cranks, which will probably do nothing if you can preload them without bottoming out the nut.
Definitely needs a spacer on the drive side.