Yep, Torso is in Bridge district.
Arms & Legs are in Lower temple sewers.

I know its a bit late but this is how i killed him (it is cheating a bit but oh well)- i placed mazzy , keldorn , minsc and a few bears rite where he appears and be4 he gets a chance to speak i beat the crap out of him- he just stands their like a lemon- actually did this with firkragg aswell but he did eventually realise wot was goin on

kill linch= use any magic weapon(+3 o more)and rest magic resitence + magic misil

semi-linch= you need the killer (special hability of principal character) and any character damage the semi-linch (my english is bad, and your spanish?)