The Machine frame has external cable routing to keep things simple. The top and down tubes are shaped so that the cables are hidden in plain sight. You can still use Stealth dropper posts which will feed through a very accessible port on the seat tube. More details will be uploaded here when we have the photos ready for you.
Advantages of external cabling.
The biggest advantage of external cabling is easy of installation when building your frame or replacing a worn cable. For example, its race day or you are in a major hurry to change a cable or need to install a spare brake, this option is going to save you time and energy instead of bleeding the brake and changing the olive-seal on the brake cable.