Oh man, it was a bit of a challenge to run mechanical housing through the top cap/cover. It had me seriously considering if I should just pay up for Di2.

I hope the pictures are helpful and here's the process that worked for me.

1. Here's a shot with the Brake lines in place and the top cover off. That part went easy enough.



2. Trying to put the cover on with both mechanical gear cables/housing
- It's really hard to get the cable housing to stay inside the center notch....
- It's impossible to install the top cover and squeeze in both gear housing lines at the same time with the monopost in place.

My solution.
a. Take out the monopost
b. Run one gear housing first
c. Run the cable line from the other gear separately.



3. Feed the other gear housing through



4. Insert the monopost back in.



5. That's basically it. Here's a couple more images of the cables out the front and back. Notice that the gear cables are not routed through the bars (as Tririg suggested) I'll likely post a couple more pictures in better light/quality tomorrow to show the finished product. It seems like there's a lot of adjustablity in the monopost height with this set up.