A 3D Solidworks Drawing (STEP FILE)

I have designed something on google sketch up, but when I convert it to DWG then import into AutoCAD then from that import it into solid works the drawing has chunks missing, faces not present etc.
So I need the sketch up drawing from scratch in solid works or other CAD software so I can produce the STEP files that are needed for CNC machines.

So basically copy the sketchup dimensions and re draw in CAD (Solidworks etc) simple enough but I cant use CAD :(