Hi Franco - currently there is no method in MoI to import a DWG file.

Check if the program you are exporting from supports any of the IGES, 3DM, SAT, or STEP file formats for exporting data and if so use one of those formats instead.

If there is no possibility for that, then try using either the Rhino OSX beta (http://mac.rhino3d.com/) or ViaCAD (http://www.punchcad.com/p-9-viacad-2d3d-v8.aspx) as an in between step for reading the DWG file and exporting to one of the above formats.

- Michael