The ironskinned template quick and rebuild rules are the same:
Speed: Ironskinned creatures move at half the rate of normal versions of the same creature due to their weight and thick builds. However, they suffer no reduction in movement from medium or heavy encumbrance or any kind of armor.
Skills: Ironskinned creatures suffer a –4 penalty to all Swim checks due to their weight and thick builds.
Saves: Ironskinned creatures suffer a –2 penalty to all Reflex saves as a result of their thick hides slightly slowing them.
Vulnerabilities: Ironskinned creatures are vulnerable to sonic damage.