P.S. I started with a Sphere,, gave it a UV of 8x8 with the Apex's at the rear and front of the car,, I then just started squaring off the bottom and added points where needed,, After I got my final shape, I cut the wheel openings out. added a little trim to them. then did the same to the rest of the car. Just went around and separated panels with 2 offset curves to get the panel gap's.
Pretty quick model. I made it in about 3 hours total,, and about 1 hour to get the main shape out of the Sphere.