Rigth now we made CADS and it should work. It would be like this (in the color of the cheapest fillament we got lying around) :

The measurements are 70mm X 30 mm give or take on the widest part. One of the most important detail to keep in mind if you want to integrate this part to your project is the assembly, we recomend to print the cylinder housing in one piece to prevent unwanted wiggling. 

Jonathan made an animation of it working and it looks just great:

So we will print this out and tell you about it. But please let us now what to take into consideration for the project, beacuase the goal is that you use it and make a really cool robot with it.