Over at Make: Projects, there are some TurtleBot related projects that have been added recently. These might be fun weekend projects for you and your local hackerspace or a starting point for developing your own ideas.
One of the projects we contributed is how to make your own 2" standoffs with simple handtools. If there are other tutorials you would like to see or parts you are having trouble making, let us know.
Also, we should have a kit of parts for the arm available in the store next week after the Maker Faire.