@mk_1: the models are very low poly and I have reduced the skin size and added a nmap. I think this is o.k. Btw, the player will see the zombies in masses, no time to study skins.

@ratchet: I will have one main model (the torso) - this model will create all other limbs. These limbs will have their own action.
The main model code includes the "commander-system".
If you shoot on one limb - this target will give informations to the torso.
And the torso give the commands for all reactions.