A client on Fiverr asked me to create a rig for this model. I decided to to rig it in both FK and IK with a switch in the viewport, for the client's comfort to choose. Hardest part for me to figure out was the little pistons in the legs. Had to add two extra bones and set them up so the pistons would work in both the FK and IK settings.
I take no ownership of the model, it was provided to me by the client.
Rig Showcase