Here is a closer view of the red highlight material, made using the DGS material. I really like this one!

I am going to add some sticker detailing now and hopefully the extra detail will add to the realism.

Also I realise I have been rendering at 920x720 despite my settings saying 640x480. Tried changing the settings but always renders at a higher resolution than I set - why is that? I have been unwittingly breaking the forum rules on image size with this one!