Can you really model a car in AutoCAD to be realistic like SW or 3DS Max, becouse they all are ''squared''
It´s possible in theory using the materials library included in AutoCad, nevertheless you'll need to get yourself involved in wide use of this library.
There's a big BUT and it would be that the final result is not as far as good like the ones produced by Inventor, SW or Catia.
Give it a try anyway and watch the textures and material of AutoCad.
Export any 3D auto cad into Navis works. I did and do it. Navis works has a library of materials that can make anything realistic. I was is solid edge for 3 years. I came back to ACAD. See some of my models. I promise that after I finish my project of this cement plant, I'll give some of my cars for you. You don't have to be technical to work with Navis works.