I'm working its bigger brother but thought why not make one of the small ones that only use 3 servos. So I took some of the servo mounting parts for the bigger one and put together this design.
Oh I needed to extended the rectangle bit by 5mm, and sand down the disks. I'll upload these changes soon.
I have a vid of it moving here https://www.youtube.com/watch?v=ZOnvJ-2WRsE&
For those without printers there's a version optimised for SLS printing on my Shapeways page (available once updates are applied and tested).