SuperSix Evo frame
Zipp 404 FC Tubular front
Zipp 404 Clydesdale tubular rear w. eccentric hub
Hollowgram SiSL cranks converted to single ring
Speedplay Nanogram pedals (or make your own for far less)
3T Ltd finishing kit (bars/stem/seatpost)
Lizard skins DSP tape
SRAM S900 carbon levers
KMC S10-SL chain
Powercordz
Front EE Cycleworks brake
Vittoria Evo 320 TPI tubs, glued.
Something like:
SuperSix Evo frame
Zipp 404 FC Tubular front
Zipp 404 Clydesdale tubular rear w. eccentric hub
Hollowgram SiSL cranks converted to single ring
Speedplay Nanogram pedals (or make your own for far less)
3T Ltd finishing kit (bars/stem/seatpost)
Lizard skins DSP tape
SRAM S900 carbon levers
KMC S10-SL chain
Powercordz
Front EE Cycleworks brake
Vittoria Evo 320 TPI tubs, glued.
That should be well under 5kg.