Hi. Quite new to composites, dabbled about a bit done lots of research online and bought some books, but after a couple failed moulding attempts I've decided to try a simpler project and reach out for help! 
Front winglets seem to me a simple project to make.
 looking at making a pair similar to what's in the picture. I could get my hands on a pair of ali ones to take a mould from. I plan on taking moulds using the Uni mould kit. Need advice on how to get both sides cosmeticly pleasing. Mould of each face and bond together with foam core? Split mould designed to be a closed mould and used to compress the CF producing one piece straight from the mould? Just need advice on this before I start making the mould as would affect the design.

Many thanks

Stainless sounds like a great idea as it will be nice and shiny already :-)

One thing to take into account if you decide to go the prepreg route is the time taken to heat up the steel. If not enough time is allowed the resin next to the steel will not cure properly.