That picture is very close to being good enough to use. I would be able to create new vector art from that, although some of the details on the cars would have to be guessed. It looks like the smaller car is a duplicate of the larger one with maybe a few small changes. (Like the grey on the tires) so that helps.
Anyways, I believe it *CAN* be done from that picture, although it would be really nice to have a better detail shot, especially of a car.
I'm currently all booked up with some other stuff I'm creating, but if you don't mind waiting (Could be a while) I can give it a shot for you. Maybe someone else will take it on in the mean time, or maybe a better picture can be located. Even a good clean shot of the marquee might be usefull if it shows the car clearly.