Hi Chipp, it's not easy to go from SketchUp into MoI because things like those round looking housings are not truly round things in SketchUp, they're made up of a whole bunch of little individual triangle facet pieces.

CAD programs are not designed to work with highly faceted objects like that, so it's difficult to take triangulated data and convert it into CAD data. It's possible to go the reverse way which MoI will do when you do a SketchUp export out from MoI - when you do this MoI will take the large smooth CAD spline surfaces and dice them up into little facet pieces. But it's very difficult to try and automatically reform large smooth surfaces from already decimated facet data. That's why MoI has an SKP exporter but not an importer.

So really your data there is not in a form that will import very readily into MoI, since it's in a polygon mesh format you could load it into a polygon mesh modeling program but not into a NURBS focused CAD program like MoI.

A couple of things you might try would be to see if the Rhino mac version can import it and convert it into a rather poor NURBS version by using the MeshToNURB command - this will likely not work very well because every separate triangle in the polygon mesh object will become a trimmed surface in the NURBS object and CAD objects are not meant to have such a high density of little tiny separate surfaces like that, they are meant to have large smooth surfaces that have trims on them. So it will probably not work very well.

You could also look into using Wineskin to run the the Obj23DMWireframe converter program.

Another possibility might be Max's OBJ loader script from here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4104.6

But likely none of these will yield very good results because your model data being all in triangle mesh faceted form is just fundamentally a different kind of data than what MoI works with itself for modeling.

- Michael