Sure bars are drilled on the flat section of the drops as close to the end as possible without interfering with the junction. The holes face each other across the bike. So the left hand hole is at 3 and right hand 9 on the clock if you look at the bar end.
The wires travel outside of the bar, under the tape between the holes and the levers, bike facing side of the bars, as the holes are. The cable between the shifters runs inside the bar and out both holes.
The cable to the bb junction runs out of the lh shifter with the rear brake hose and they are shrink wrapped together so all you really see are two brake hoses coming off the bars.
If we do another I'll take pictures during the build but we were too busy to do that this time around.
As this is my bike I'm happy to be a guinea pig wrt the drilling. Not sure I would do this for a client even though I'm confident there is little to no stress on the bar where we drilled. It's around or behind where my 5th finger would rest/grip on the bars,
Thx a lot!! I drilled 2 holes in the top section a bar, at the end of the cable groove, so that the wire between both shifters goes inside to pass the stem, but in a straight line. Next time, I may do like you and run a much longer wire between both. My current one is merely 550mm long. How long is yours? The one hole at the bottom part of the bar is similar to yours.