Hi Brian
I'm afraid not. I've worked with Autocad full time for the past 15 years. It doesn't have the surfacing tools or meshing tools to create the complex curvature of a car or aircraft accurately like you can do with good polymodeller such as 3DS Max or Modo. It is very good with creating more basic models of building, mechanical assemblies that sort of thing where you can do lots of booleans.
As far as I know one of the more high end nurbs modelling packages is Catia.
