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This appears to be a complex wooden chest of immense size—at least 5 feet long and 3 feet wide and tall, with numerous drawers, side-compartments, hatches, and lids and ornately carved feet and scrollwork trim.
In spite of its size, a chest of defending has an interior volume of 6 cubic feet. It has permanent alarm and arcane lock spells cast on it, which can be set to acknowledge a specific creature as the effective caster of the spells with a command word (thus allowing that creature to determine the details of the chest's spells as if she had cast them). This password is normally carved in one of the small drawers. All the compartments of the chest have average quality locks, and can be further locked with padlocks (not included).
If the chest's alarm spell is triggered, the chest's most impressive magic property comes into effect: it alters shape and composition to become a Medium wood golem (the chest's contents are unharmed by the transformation). Unless given different instructions by someone who uses the chest's command word, the golem attacks the creature that triggered its alarm, then folds back into a normal chest once the trespasser is defeated. All the items within the chest count against the golem's encumbrance.
On command, this semiprecious stone adheres to an object weighing not more than 100 pounds. As long as it is attached, the stone increases the object’s hardness by 5, its break DC by 5, and its hit points by 20. Like temporary hit points, these additional hit points are lost first when the object the stone is protecting is damaged, and once they are exhausted, the fortifying stone is destroyed. However, unlike temporary hit points, they can be completely restored by repairing the fortifying stone via a single casting of a make whole spell. Any effect that breaks or destroys the protected object also destroys any attached fortifying stones.
If you place a Fortifying Stone on a Chest of Defending, and then it transforms into the Wood Golem, would it gain Hardness 5, and the Bonus 20 Hit Points? Or would this only apply when it is in chest mode?
As a Wood Golem it is no longer an object, thus it only applies while it is a chest.