Hello,
I would really like to attempt this project, although I'm a bit unsure about its scope. Just implementing the tutorial would be simple. I am very familiar with processing, as I've done most of my computer graphics coursework in it (including feature detection, description, and matching, which might be important if you're thinking of using something more complex than a simple homography marker.) Having taken a look at the nyartoolkit, I believe that it's quite robust and the project won't require any other libraries or custom algorithms.
Beyond that, I'm proficient at 3d-modeling and would be able to model whatever figure you would actually like to display. I can also write shaders to make it pretty in realtime if needed.
Do you intend to deploy this on iphone/android? I know frameworks for processing exist that allow iphone/android deployment, however, I cannot vouch for their speediness. Another solution would be to use nyartoolkits native android wrapper.
Please let me know what exactly you have in mind. Perhaps you wanted to project something more simple or complex.
Thanks!
Stefan