I posted a while back on the BP Stealth and other radical carbon monocoques. I will go over what I had said and will add a thing or two.
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Gore Tex or similar-type cables.
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Rollamajig or other rear mech tensioner, as it takes away some housing and makes a cleaner shift.
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Shorter housing than you think you need. Routing from the top of the bar works better, and is more aero.
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Bartol System to rid yourself of that front mech.
I added #2 and 3, as I was working on Samantha tonight and remembered how I got it to shift as well as she does.