There are a good handful of pan and tilt camera actuators for sale out there. They seem cool but why purchase one when you can spend five consecutive weekends in pure solitude fumbling over machining tolerances and demoting your "nice" jeans with incidental cutting oil while making one just like them on your own?
For real though, I love this project. Pan, tilt, and translation. It's the perfect triumverate. The ultimate ménage à trois. The Father, The Son, The Holy Spirit. Moe, Larry, Curly. Snap, Crackle, Pop. Ding, dong, ditch. Beyoncé, Kelly, Michelle.