I'd probably structure it a lot like a bootcamp. Check out Flatiron, gSchool, or Dev Bootcamp's curriculum for some good ideas. To summarize, though, typically it's a few weeks of learning a high-level language (Python or Ruby). From there, it's typically a solid couple of months of learning the corresponding framework (Django or Rails). All the while, sprinkling in some JS and CSS magic.

They're usually able to churn out some pretty decent full-stack programmers after 3 months, or so (granted they meet a lot more frequently than 3 hours per week). You'll have to be super diligent about giving them assignments, but the nice thing is that there are so many resources around Ruby and Python... Codecademy, Treehouse, Rails for Zombies, etc.

Come back and let us know how it worked out!