Err, loose the mech, make an ultra lightweight tensioner, make it so it tensions the chain upward which means less links. Lightweight skewers, carbon bars maybe Also, Change the rear rim and fill the tyres with helium. (only saying that because nobody has done it before). Although, as the helium molecules are small, they will escape the tubes and you will have to fill it back up quite regularly. Also, i can't tell from the pic, but cut down the steerer if you havent already. And possibly a smaller front brake. Maybe a different BB aswell, but thats all i can think of.