In IntelliCAD (AutoCAD clone), I drew lines and arcs. I exported the drawing to a DXF file. I imported the drawing into AC3D. I created separate surfaces. I merged the surfaces into one object. I fixed any problems with vertexes. I combined the separate surfaces into single surfaces. I had to create two single surfaces because if I try to combine all of the surfaces into one surface, the door opening would be filled in and some surfaces would be missing from the front fender. The front fender is separate from the rest of the car body. Any suggestions?