I was just thinking about this the other day. "SInce most Di2 frames have internal routing for the electronic parts, would it be possible to mount mechanical components so that you can have an aero road bike? For example, the BMC Team Machine SLR01 Di2 frame has internal routing for Durace Di2 and Ultegra Di2?" So yeah, is it possible to mount mechanical components onto a Di2 frame? I'm dreaming of using a Di2 frame as an aero road frame to mount Sram Red components. I'm not a big fan of cables sticking out and being exposed.