I'm in the middle of a DIY mechanical-to-Di2 conversion. My aluminum frame, custom-built circa 2006, has been modded with a Dremel to go from external cabling to internal wiring, and then it was repainted in a home-made spray booth. I temporarily remounted the rear mechanical derailleur with a long section of cable housing so I can use the bike on my trainer. Once the seatpost battery is back in Shimano's stock, I will order the Di2 components I need all at once (which should be in the next couple weeks).

Pre-project;


beginning to modify the BB shell to fit the B junction into the down tube;


making one of the holes for internally-routed rear brake cable;


frame cable guide in place;


and removal of the welded-on external cable stops.



Flat black base coats applied;



masking for logos, etc.;



gloss white and clear coat applied;



dried and ready for reassembly;



and ready to go back on the trainer until phase (Di)2.



I will take more photos of the modded areas just prior to installing Di2, as well as photos of the install process. Looking forward to finishing this project!


[Edit: I also have these photos in much higher resolution, natch.]

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I race duathlons and like it.