You can get the step file for the complete 2.x here I think:
http://www.buildlog.net/wiki/doku.php?id=2x:2.x_laserI've played around with Solidworks to build the frame in the past, using the Weldments. Creating a 3D sketch and making custom weldment profiles allows you to make a single part file for the entire frame, and then adjust it to whatever parameters you need.
I can't find my old files, but I based it all off of the Step file that is posted in the wiki