You can download SketchUp for free at http://sketchup.google.com/download/
Download the file for the entire model here
Included are not only photos and the SketchUp file for this model, but also for my 3 other Knex supercar models, as well as some random other experiments.
If the host doesn't work, try downloading from here
NOTE: You will need WinRAR to open the file. Download WinRAR here.