I'm thinking of doing 1x Di2 with Shimano XT Di2 rear and Climber Switch on Trp Hylex.
I want to have it as clean as possible, so is it possible to extend and route the climber switch down through the Di2 port down to the 2 port junction box that is inside the frame?
What is this 2 port junction box of which you speak? You'll need some form of Junction A box, whether it's an EW67, EW90 EW-RS910 or a handlebar gear display.
OK, so cleanest would be the EW-RS910 with drilled bars. How would the routing go from there? Is it from the EW to the R600 and then to a B-Box in the frame to the battery and rear derailleur?
I'm thinking of doing 1x Di2 with Shimano XT Di2 rear and Climber Switch on Trp Hylex.
I want to have it as clean as possible, so is it possible to extend and route the climber switch down through the Di2 port down to the 2 port junction box that is inside the frame?