S'mon said:BTW I suggest that realistically (ie, to avoid too much cheesiness) a 'war maul' like Thorgrim's to be usable would have a mostly wood or possibly stone head, faced in metal, not solid metal. That's certainly what I thought it was when I saw the movie! 8)
edit: oh, I also think AP9 is way too high for this weapon. It certainly should be no higher than that of a bardiche, which is a big hunk of metal on the end of a stick, but also has a curved blade for superior penetration.
I agree with your first point S'mon, I thought it was mostly steel reinforced wood.
Regarding the AP rating for such a weapon, I can see where you're coming from, but huge bludgeoning weapons such as a maul tend to hurt you no matter how much armor you're wearing. They might not cut through or pierce the armor, but will certainly dent a solid metal armor.
How to model this accurately and still keep the game simple I don't know, but I'm fine with the AP rating. Mostly because I love bludgeoning weapons and my group is always running around with sissy-looking blades...

TTFN,
Yokiboy