Thanks guys. I thought about the paint for a while, and even though it is nowhere near the correct Mclaren color, it is as close as I could get it. I just sprayed testor's chrome silver over a gloss black base coat, then followed it up with a few coats of clear. After the decals were on, I added a few more coats of clear so I could polish it out. The color looked better before since the clear made it more of a "silver" than a "chrome", but I knew with all of the handling necessary for the decals that the silver would have to be protected. Hope this answers your questions.
I have also heard of people covering the entire car in Bare Metal Foil, but I am nowhere near good enough with that stuff to attempt that.