So I've decided to make my first project with carbon fiber a difficult one(not smart?). Ill post pictures as I progress and advice as to what I'm doing would be appreciated.

The idea is to make a mould that wraps around the edges as they can be seen while on the car.

The clay in the front of the light is to fill in the cosmetic groves that the carbon probably wont lay into, should I just fill them in with Gel-coat and sand them off the mould, or try to fill them in like I have now? The clay is hard to smooth out nice and ill probably have to sand anyway.

I would like to make this a repeatable process because I'm practicing on a used pair of lights first and if it comes out good Id like to do mine.

prep for mould making so far

yes you should use a gel coat on top of the resin as that will be a surface you use bagging tape on to get a seal (if not envelope bagging).  If you are extra paranoid about the strength of the mould, srew a few screws in half way in the putty on the mould to give a solidly mounted item the new putty will set round.  new putty on old putty will always be a slightly weak bond so an extra mechanical bit of help might stop the flange cracking off if your a bit heavy handed releasing a part or bang the mould.