Here are some pictures. Note that this is with a SRAM PG1170 11-36 cassette (I hadn't recieved the Shimano 11-42 yet, so I used this to set up the TanPan).
The M8000 Shadow Clutch RD and the Goatlink Extender. Note the exit location of the RD shift cable on the chainstay. It's too close to the RD to allow you to mount the TanPan back there.
And the Tan Pan inline setup hanging under the bars.
Here is a close-up of the TanPan. You just thread it around the inner ring, through the small hole, and around the outer ring, then through the rest of the cable housing. It's a ball-bearing disc, and it doesn't seem to introduce any noticeable friction into the shifting.