It looks very good unbroken-fighter! Markschum has already offered to rig it, I would accept that offer if I were you, but I will make you a different offer.

These hydraulic ram type questions keep popping up from time to time. I would like to do a comprehensive  freebie tutorial on this, but it's hard to explain things properly without actual example geometry, so that it can be done as a hands on exercise. I suck at modelling, and it would take me longer than I'm willing to invest to come up with my own mesh.

If you will let me distribute your geometry with a tutorial. Then I will write a tutorial on how to rig it. You would of course get prominent credit in the tutorial as the author of the mesh, and I could include any licence conditions that you may want to have. I'd post the tutorial here at Rosity, and at sharecg, and anywhere else that you may like to suggest.

The tutorial itself would probably be in PDF format, with some illustrations where appropriate. It would be put in a zip together with the obj file. It might take a few weeks to get it into a final polished form. I could send you draft copies, and you could point out any parts that need clarification.

Think about it. I will send you my email address in an internal message.