did you import the components into solidworks or made them yourself? I've tried importing sketchup files but most of the time you're better off redrawing them.
I made the G5 case, H100 rad and akasa 180mm fan in solidworks as i couldn't find these online for free and I had all the parts to take measurement’s from so it didn’t take too much time. I downloaded the mobo, cd drive and ssd from www.3dcontentcentral.com they were all already in solidworks format so they are easy to work with.