I will make full build post. hopefully within a week.
I ran the 4 cables via the large opening of bars. I figured there would be less tight bends. Plus I wanted fully internal.
Fork
I ran two housings left and two right of fork. One housing on right going into the fork. If you run housings same direction around fork it wants to pull and or pinch. I ran cables into housings before fully compressing everything.
I slammed the stem no spacers needed and I used jagwire keb-sl and lex cables.
The fully internal route on these bars is a nice option.
Yeah, +1 for making sure the cables and hoses to/from the right and left shifters are routed down the headtube and around the steerer accordingly. Also, taking a look a kbike's photo, I'd highly recommend running the cables and hoses parallel to each other through the handlebars and down the head tube without crossing over, especially if you are using spacers. Looking at that space right before the cables and hoses take the 90 degree turn down, there is actually enough room to run them all parallel to each other all the way through the bars, through the bend, and down into the headtube.
I found that if I crossed them over anywhere along that length, the pinch point eventually caused the housings to buckle making for stiff shifting and squishy braking. It's a tight fit to get them all parallel, but I used dental tools and a small flathead screw driver to get them all into correct orientation. I believe I had the brake hoses sandwiched between the shifter cables all the way through the bars, stem, headset, and headtube. Worked great even after I cut the stem down further and removed some spacers.
