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I knew there were headset options out there but it all looked a bit complex. Either way, a guy was selling the same frame on ebay and kindly sent me a pic of the Bottom Bracket shell. Doesn't look like I could fit a Junction-B inside either the down tube or seat tube so unless there is a magic way to enlarge the holes, I'll probably not bother.
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cjr
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I'm in a very similar position as you except having a steel frame (with chainstay yoke) modified for Internal Di2. Just went round a framebuilder today and he will add a reinforcedhole at the top of the downtube, hole in the seat tube for FD cable exit and enlarge and existing drainage hole in the BB shell for RD cable exit. Internal junction B will either be in the seat tube or the downtube.
Did you consider the Ritchey logic-E headset that would allow you to bring the cable into the headtube without needing to drill a hole (if there is a vent hole opening inside)?