Solution for the twelve-piece parallel three-plank quadraplank puzzle

Before you click on the download link you should realize that

You are admitting that you couldn't solve this puzzle it yourself...
All http requests to this web server are logged and stored for a loooong time...
Peter Knoppers retains the copyright to the solution sheet document (and the puzzle). You have permission to print and store the document for your own use.
The file is a 314 kB MS-Word 97 document, or a 60kB Adobe Acrobat document.
There is a small error in the shape of the piece on the top left. One of the cubes is drawn in the wrong position. This will probably never be fixed...