Interesting, very interesting! There are so many options when creating 3D designs for printing. I started out thinking that I'd like to designs incorporated with led's or motors. I did a few ball bearing roller-coasters, but for now I'm sticking to my comic/cartoon characters to hone my Blender skills.
Be sure to let me know how you make out with the magnets. If you have any suggestions for another design I'd be interested.