Very design and smooth drawing! added to the Special thread Gallery :)
Generally a Nurbs modeler is fine for automotive thing ;)
See this guy http://www.etereaestudios.com/docs_html/nixus_htm/nixus_index.htm (cool tut inside)
http://www.etereaestudios.com/docs_html/shark_htm/shark_index.htm
http://www.etereaestudios.com/docs_html/sentinel_htm/sentinel_index.htm
and cool tut http://www.etereaestudios.com/training_img/sentinel_tutorial/sentinel_tutorial.htm