bianchi pista concept
syntace stem, carbon road bars
any lightweight seatpost
lightweight saddle
lightweight road cranks 3/32 and an external BB
road chain
alloy cog, gigas or campy

wheels depends on how much money you have, but a american classic front hub 16 spokes, and a 20 spoke phil rear 20 spokes laced to some zipp 202 rims or something like that, with dt revolution spokes.

then some lightweight tires, tufo lightweight elites come to mind.

report back after the build is finished.

should put you in the 13lb range, probably lighter.