>>You make it feel like Blender is some kind of high tech tool for modeling Cars 
Ha! Look who’s talking… :^)
>>The fun part is almost done 
Yes, The big sweeping lines are done. Today I’ve tried to remodel the ridges that go from the lamps to the rear of the car. I’m not happy with how the outer one merge with the side of the car, but I’m not sure how to do it better. There will be some change there anyway.
>>How do you do those wide sloping panels, i can’t seem to make them look right with my car.
>>Do you use nurbs?
No, it’s just an ordinary four vertex plane with subsurf. Put a vertex at each extreme location, then put a loopcut where the plane needs to deform most. Pull the new vertices to the extreme of the deformation zone. Now you should have a smooth sloping panel. You may need more loop cuts, but try to keep them as few as possible.
Hope that made any sense. :^)