yeah, that sounds good. the only damage listed for the poison is "deadly", so it must have been an instant kill on a failed save. 3E poisons are much more merciful, but the damage you listed could still be pretty fatal.
other random thoughts...
in addition to suggesting ELH feats, we can also suggest a few BoVD feats.
also from BoVD...
all demon lords have SR of CR + (10-14)
demogorgon has fast healing 10, graz'zt and yeenoghu have 5.
demogorgon, graz'zt, orcus, and yeenoghu have see invisibility.
most appear to have an insight bonus to AC that is based on Wis bonus, but Juiblex's is higher and Yeenoghu's is actually lower. orcus also has a Cha-based Deflection bonus to AC.
i finally got the BoED (yay!) and it appears to be a whole lot more consistent. all of the paragons have an insight bonus and a deflection bonus. all except for the eladrin king and queen have the insight based on Wis and the deflection based on Cha. perahps the lesson here is that if you're chaotic you don't have to follow the rules?

i'd say we should use our best judgement on this topic.
also, in BoED all paragons have their race as a subtype, so we should also reflect this in new conversions.