New models ripped and manually rigged one by one.
Since I’m not a pro animator, I used various bvh (motion capture animations) in the public domain as reference.

Although I was able to use a “universal” rig (different models sharing the same rig) to fit all animations (so i can focus on animate a single rig and share it’s animation to other rigs), I need to work on the ik of the hands, more specifically in the ik target of the arms, so that the hands rest correctly in the Handle and the Grip of the Weapons.
Another option would be to re-animate but this time with a gun rigged as a child of the arm IK.

Still need to rip, rig and remap shaders on quite some models; Infected npcs, 3 variants of soldier NPCs, black ops, red black ops and some scientists npcs. Not to mention some unique enemies like greys, MITES (deer ticks) and the Theta (this last one will be hard to rig and animate, since its not humanoid and in gameplay I do not have many good references on how it walks).

Finally, I have made some improvements to the shooting range. Adding more props, enriching the environment.

BEFORE:

And NOW: