I'm pretty sure he is entirely cyborg. As I said, all his limbs and his jaw are replaced, and his organic parts are heavily armoured.
What do you mean, out of place? The sligs have mechanical limbs, and they can control them when they never even had any legs! That means that they probably don't have the brain function to control them either, yet they do! Packrat is a genius amounst thieves, it'd be a cinch for him to perform such... "operations".
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