Well on my work for my car I have 3 planes front,side and top the side and top line up but not the not I have tried everything scaling the plane,moving it and so on but it still does not add up....
You do not notice the misaligned vertexes until you tweak the vertexes in 2 of the 3 views then the 3rd one is the conflict.
I would love to be able to get ahold of some premade(like all the same size for modeling) planes of preferbaly(doesn't have to be) a sports car.
Other than that I'd be done with the front and I would have a model thread open. I got in 10 minutes the front hood using a nurbs plane so I'm having fun minus the reference image problem.