GM designs are done in Unigraphics and are resident in VAS (Vehicle Architecture System) in the Warren database. While it is possible to convert to IGES format, and then import into Solidworks, I don't believe Solidworks has the capability to interpret the wire frames required to create surface, and trim the edges. Only a few suppliers have access to VAS, otherwise, you have to be in one of GM'* facilities with access to the Warren or TREC databases. It is unlikely anyone with that level of access would risk the confidentiality agreement violations to "steal" a download of the math data. It is also unlikely anyone without the UG math data would have the dimensional information necessary to create a non-resident model.
Long winded way to say, I doubt if there is a Solidworks version out there someplace. Let me know if you come across one.
2001 Bonneville SSEi (retired at 365,000 Kms.)
2014 Jeep Grand Cherokee Overland (yes, I know its not a GM)