Well, first of all, I want to thank you guys for the kind words. Work is proceeding, not as fast as I'd like due to the lack of much spare time, but it's going on nicely.
Now, Paulo, that's a nice question...
Actually the mapping is not exactly "the same". It's just placed "wisely". I mean, take the rear wing for example. We have 4 different rear wings: Low, Medium and High downforce and Monza. Each of them has its own mapping, but all overlapping and with common vertices mapped together. So, it's just a matter of selecting the right piece in the shape and the correct layer for effects/livery in Photoshop. Same for all the other parts that are "versioned".
I won't hide the fact that it's not exactly the easiest thing in the world, though, eheh! Especially with such a detailed shape!