So I will build with Di2 components.
Also, DI2 on the old style P2s isn't necessarily easy. Either you end up using the stick on external cable routing that Shimano sell, or alternatively you end up doing some drilling (e.g. http://forum.slowtwitch.com/cgi-bin/gforum.cgi?post=4955231;search_string=internal%20p2%20di2; ) and even then I think you'd need to be pretty inventive to hide the battery.
Long.
I figured I could hide the battery in the frame (seatpost style battery). More than happy to drill the frame
It's a while since I looked into it, but I think that the problem with mounting the battery in the seat tube is that the BB shell is solid and so there is no way to run the wires internally.
@skinny started
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Also, DI2 on the old style P2s isn't necessarily easy. Either you end up using the stick on external cable routing that Shimano sell, or alternatively you end up doing some drilling (e.g. http://forum.slowtwitch.com/cgi-bin/gforum.cgi?post=4955231;search_string=internal%20p2%20di2; ) and even then I think you'd need to be pretty inventive to hide the battery.