Fixed Super Light Super Safe

http://www.planet-x-bikes.co.uk/i/q/SASICXZC/selle_italia_cx_zero_carbon_saddle
81g Selle Italia

Wouldn't a road frame converted into a single speed much lighter? I was about to do something like this and this was my build :
Van Nicolas Yukon Frame : 1.3kg
Ritchey wcs fork : 295g (uncut)
Stem : KCNC 100g
Handlebar : FSA K Force MTB flat - 109g
Brakeset : PX cnc - 205g for pair
Brake lever : KCNC - 46g
Cable : Alligator I-link - 20g
Crankset : Sram Red - 680g
BB : Sram
Chain : Yumeya 9 speed - 240g
Wheels rear : Chub hub + Sapim CX Ray + PX carbon 20mm = around 550-600g
Wheels front : PX front hub + Sapim CX Ray + PX carbon 20mm = around 350-400g
Single speed conversion kit : forgot the name but found ones that are 50g
Pedals : speedplay TI - 160g
Seatpost : 3T Doric LTD - 140g
Saddle : Selle Italia carbon - 81g
Seatpost clamp : PX ti - 12g
Bar Grip : KCNC : 16g

It's going to be very light..
well for stiffness not sure I weigh 65kg and more of a climber than a big sprinter.
4454g

Big sprinter - LOL

Im not sure im happy using a road frame. Im resistant as I would like this to be a proper FG/SS bike. Something that hasnt been modified. This is LFGSS so I would like it to stay as close to that idea as possible