That's just the default 'car paint' material you get with Mental Ray. It's just something I shoved on right at the start and haven't got round to changing yet.
I'm trying to model a Volkswagen Splittie Campervan (Is that a bit ambitious seeing as this is my first go modeling ? ) but I can't even model a simple wheel arch ! (Going by this tutorial someone pointed me to. If you know any other tutorials or some simple steps, I'd love to hear them
Good luck with the Smart ForTwo, will be rather fun to see a few bimbling around Liberty !
The back part is just rough, I've not adjusted that to fit properly yet.
Also remember, its not an ultra-high poly model so certain parts won't fit *exactly* due to the straight polygon edges. I'll have another go at the part over the lights a bit later.