Suurland uses trimmed surfaces, which will make your life a lot easier. Also, for the VW, he used Rhino, which is a lot more forgiving than maya.

with the method you're using, the key is using align surface and align curves in order to make make the surfaces join as seamless as possible. then use the mel script, it's at Highend3D...think it's called pointsaverage.mel that will help you close up your gaps as well.

also, you don't have to draw curves for both sides. but i took suurland's advice, so on areas that you wanted to go seamlessly over the centerline (hood, trunk), i drew my lines across. everything else was duplicated over.



hope this at least gives you an idea of how to work. it's a little tough getting the workflow down...