[Zeke]

A smooth shiny look is achieved by laying up composites on a smooth shiny surface, like a mold. The backside of any F/G or CF part you see is rough unless it's a cavity mold. Very rare in cars but used in furniture manufacturing. The original early Corvettes were smooth on both side making repairs easy to spot.

So, after bonding the CF to your existing fiberglass parts, you will have an endless task of spraying on a clear sandable product to get a decent finish. This will tend to cloud your CF fabric unless you use water clear coats which don't sand well at all.

I ran a fiberglass operation early in life and although this is possible, I wouldn't touch a job like that.