Step is a Nurbs format!
Totally different than SKP file!
So you must find a converter!
You have this free stand alone who transform a format OBJ to 3dm by Michael Gibson
(author of the famous Zen Nurbs Modeler MOI3D (not free)
(3dm another commun Nurbs format)
Result will be a 3D wire frame!
It's more prudent to not take files of millions of polygons! π€
So transform first your SKP in OBJ by TIG plugin OBJ exporter if you have not Pro version of SU!
Here in Moi but will be the same in another Nurbs program! π
SketchUp can import Adobe Illustrator files in the for of AutoCAD Drawing (.dwg) or AutoCAD Interchange (.dxf) file formats. To Import an Adobe Illustrator file:
Export the Adobe Illustrator file as either a .dwg or .dxf file from Adobe Illustrator.
Run SketchUp.
Select File > Import. The Open dialog box appears.
Navigate to the .dwg or .dxf file.
Click the Open (Microsoft Windows) or Import (Mac OS X) button. The file is imported.
A Google search will turn up a lot of information.
I suppose with yearly updates less can be expected, but, yes, I didn't see anything that had "wow" or "at last!" (sic) flavor to it. The speed improvements probably make it worth my while to go on from v.8, but I don't want to lose 1001bit tools just yet. The 3d warehouse and webgl are looking good, though that's not something I spend much time with myself.