If you are doing ongoing classes for older kids, your approach would have to be different than what I do for a single session 1-2 hour workshop. The kids I work with are mostly Zome newbies who are delighted to figure out things like the the color coding of the struts and their unique end points.

Grandma- Zome is really, really fun. I have seen kids build towers taller than me, huge spheres, bridges... They are often used in math and science classes to build molecular models, polygons, etc.