Fighter 4

+1 BAB, +1 Fort, +1HP

Weapon Spec Greatsword (until Earth Breaker)

+1 Know (Engineer), +1 Craft (Blacksmith)

Done

Fighter 6

Bravery +2, +1HP

Bonus Feat: Vital Strike

+1 Know Engineering, +1 Craft Blacksmith

Done with combat upgrades.