7ka
Nice work.
It is my own design 3D robot model. His name is Karmashik.
It is ready to move any movement you want. Rigging method of this model is, linked body parts by hierarchical relations. This model not made with physics modifier or biped.
You can move all body parts and make any pose and animation without biped. When you move torso, all body parts will move. All joints are prepared for move and all parts linked together hierarchically. Pivot points moved to place where must to be.
Have fun...