Was thinking of an entry point at the front end, hopefully room for a junction box in DT with access from the BB (big if) and an internal battery in the seat tube. Then a hole near the bottom if the seat tube to supply the FD and an external run to the RD.
Looking to switch over the Di2 setup from my Fairlight for some more off road fun over the spring/summer. Trying to do it with a cheap frame, once you get the up to date features, internal routing, flat mount, thru axle etc the frames start to get expensive. I'm seeing at as an experiment really.