Are the warforged any less powerful as a Pf race? If not, that would be an argument for the stats staying the same, if everything else stays the same. Also, removing the Wis penalty encourages warforged clerics and druids, which may be a design goal, but I would consider a negative.
Since Pathfinder constructs are not immune to critical hits, that would be a reason to get rid of their fortification ability. The rest of their immunities still make sense. They don't have blood or any kind of fluid, so poisons would be nonsensical. You could argue that they are "living" enough that they can be energy drained.
In any case, spare parts and the like are not an issue, since they can be repaired using any of the techniques that work on constructs.
I would make one of two suggestions wrt warforged:
1) Drop the fortification, leave everything the same
2) Rebuild them as monstrous humanoids, making living construct a subtype with whatever immunities you deem appropriate. I make take a page from 4e and give them +2 natural armor and allow them to bond with suits of armor, rather than using the weird and kludgy feat-based approach.