Looks like that site in general is having issues. You can read the post through the wayback/internet archive.
The PDF linked to the in the article never worked, but the PING and GIMP file links work; just remember to remove the archive.org bit from the link and go straight to the dropbox location. They are fairly low resolution, so if you want to print your own you may wish to scale the image up first and draw on that, using the outlines only as a guide :)