How to Create Ragdolls for Ported NPC Models?

So I recently ported a few NPC models from a game, and wanted to know how I would create ragdolls for the models that I ported. These ported models won’t be for posing, but for (S)NPCs.

http://forum.facepunch.com/showthread.php?t=1545984 should give you some help

Much appreciated, thank you.