I wasn't aware he had a craft.. BUT IF HE DID.
I'd prolly make him a Weapon smithing.
I don't have a belt of great agility, only boots of dexerity.
What I researched was, My fortitude is my my base + whatever my skills were
So for Fortitude, is my con modifer, so 3.. + something, I don't know off the top of my head where my ability modifer is coming into play.
My reflex, about the same
Will though, I can tangibly tell you why it's not +2, it's base 1, and I get a +2 for Iron will as a class feat, and then another +1 for Carefully Hidden as a trait.
This post is gonna be modified as I'm trying to remember how I got those totals..