Sollir Furryfoot
Explorer
Hrm, must be my silly interpretation then 
It is instantaneous though, so it shouldn't be effected by fireball as long as it wasn't created in the antimagic field
As for Hide Life, it depends on how you interpret it. I personally interpret it as the spell effecting the receptacle (storing the caster's soul in it), so therefore, if the caster was below -10 hp and the receptacle was in an antimagic field just then, then the caster would die-where as, if you see it as the caster being effected by the spell, then the caster would simply die if he entered the antimagic field, and when its away he would remain dead since the soul would have fled the receptacle before then (IMO, of course).
There is an Encylcopedia Arcana book from Mongoose on Constructs that has a variety of simulacrum templates in it, but that's not really official, either.

It is instantaneous though, so it shouldn't be effected by fireball as long as it wasn't created in the antimagic field
As for Hide Life, it depends on how you interpret it. I personally interpret it as the spell effecting the receptacle (storing the caster's soul in it), so therefore, if the caster was below -10 hp and the receptacle was in an antimagic field just then, then the caster would die-where as, if you see it as the caster being effected by the spell, then the caster would simply die if he entered the antimagic field, and when its away he would remain dead since the soul would have fled the receptacle before then (IMO, of course).
There is an Encylcopedia Arcana book from Mongoose on Constructs that has a variety of simulacrum templates in it, but that's not really official, either.