I finally got a chance to get this build pretty much complete and I figured I should share. This bike was built from a frame and was 6800 Ultegra/RS685. Last Summer:
My wife decided to try DI2, so we went with Ultegra R8000+DA 9170s + the bar end charge port and Bluetooth unit:
FD wire routed through enlarged boss:
Rear Der Wire:
BB routing (enlarged drain hole - battery in seat post - B junction in seat tube):
D-Fly and internal bar routing:

Bar end connector (A junction):
Under BB routing: