Alibro (03/07/2014)

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Ha, never thought of using chipboard Nice one, I used clay for my last attempt at making a flange but found it really hard to keep it to the edge of my part as it had a long curved edge. I ended up with the flange too far up the edge of the part and had to mess about with the mould to get it near the correct dimensions, it will probably only work once before falling apart. If I try it again I will use flexible plastic on the curved bits (probably supported by clay or plasticine) and your suggestion of chipboard for the base.

Good luck with it Whitecel but you might find it easier (and a hell of a lot cheaper) to wrap the part.
This guy does it for a living and shows how he does it here.
http://ocarbon.com/blog/

Wrapping is just unnecessary weight and often doesn't work well on plastic trims like this. This is such an easy part to mould and produce, it just takes a bit of practice to know where you need to put things.