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'Work hard play hard' ;)
I can easily make it under 6kg, but as I said rather make it 'Look fast' first then worry about the weight side.
For the DA cranks, I can never get my head around the way they look and much prefer the aesthetics of the Rotor 3D+ (just a personal preference)
For the wheelset I went for these mainly for the hub and the wider rim profile, which a lot wheel builders recommends.
wait is this what they call 'student budget'? ;)
Deep section wheels and Di2 ≠ weenie
I'd stay DA for cranks; much more advanced engineering/design than Rotor. Wanted to say same about the brakes but you've already got them. Plus they pop up on gram and tumblr more than Rotor these days.
Pedals; if you havent got em get the cheap speedplays on ebay and swap axle to Ti.
How about mega light Ryde pulse wheelset with Bitex/BHS hubs and then deep section for windy days :P
And latex tubes.