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@Smallfurry
Near perfection, and you did'nt use them....?
The braking is fine with decent carbon specific pads. The problem comes from heat disapation, or lack thereof. So on long decents the brakes can develope a unnerving grabby nature. The tune shwarzenbuggerluggerboobaas have a alu mesh on the surface which adds little weight, yet vastly improves braking. Want.
Also if you must buy some carbon Ebay rims, get tubs. Even aluminium rims struggle with the lateral force of a high pressure clincher tyre. Carbon rims can struggle a lot with this (mine are kevlar reinforced in this area, I researched this aspect a lot)). I'd also vote for internal spoke nipples, as the drillings are smaller, and the nipple-rim contact area larger, to better cope with spoke tension.
Ultimately, there is little weight saving over aluminium unless you want a deepish section rim.