I love Mathias's website and have recently built the jointer based on the pictures. I use CamBam myself as I am cheap! and I found that woodworking is easier with all the tools, so I stretch that dollar.
Mathias uses sketchup for his design work. Here is a link to a website that says you can go from Sketchup to gcode with a plugin. I have not tried it myself. Sketchup is free and according to the website, you don't need the Pro version, just the plugin.http://www.instructables.com/id/From-SketchUp-to-CNC-Fabrication/