QUOTE (Androcomputus @ Mar 31 2010, 03:04 PM)

One of my players has replaced all his limbs with cyber versions along with his skull, and torso... To my knowledge all that remains is just a brain in a can along with his stomach... (Think Victor Can Carne with a robot)
I know that realistically bullets would have a hard time "killing him"... does anyone know how I should handle damage for this cyborg or what page this information would be on?
He still retains all his inner organs. Neither the cyberskull nor the cybertorso replace them. They are mere casings to protect them. Their added resilience is symbolized by the added physical damage threshold (+6 in this case). If the cyberlimbs are armored, that adds additional resilience as well.
Your player still has a brain and all his other organs to fail, get damaged, poisoned, smashed, stabbed, cooked...
If he wanted to be a brain in a jar, he'd have to use the cyborg rules from augmentation, which are simply unavailable during character creation and next to impossible to get during gameplay unless you, the GM specifically allows it. And then he'd just be a jarhead in a drone.
To answer your question about rules and where to find them:
QUOTE (p.343 SR4A)
Cyberlimbs have other useful features. They also grant the user 1 extra damage box to her Physical Condition Monitor for each cyberlimb she possesses.
QUOTE (p.343 SR4A)
When a particular limb is used for a test (such as leading an attack with your cyberarm), use the attribute for that limb (natural or cyber); in any other case, take the average value of all limbs involved in the task (round down).
QUOTE (p.344 SR4A)
Armor enhancements installed on cyberlimbs are both Ballistic and Impact, and it is cumulative with all forms of worn armor.
Rules on Cyborgs: p.158-164 Augmentation
Sidebar listing the comparison between fully cyberlimb replacement and Cybrogs (Brain in a Jar): p.159 Augmentation