Hungry Undead: a Racial Class for Any Edition of D&D

This is a class for any edition of D&D that you can play when your character starts as (or becomes - you can multiclass into it!) undead. It has mechanics for 

• rotting
• individual parts (limbs! heads! Your torso!) being destroyed but you being fine
• hungering after the flesh of thinking beings 
• attaching new parts to the stump that your old part rotted off of
• getting special abilities from your menagery of rotting parts (if they came from something that had parts with special abilities)