I've got one I've literally just dissembled and stripped a few days ago - there are 7 pieces:
Legs, Torso, Left Arm, Right Arm, Head, Lower Jaw and Shoulder Pad (fluffy bit with a horn sticking out of it, attaches between the Right Arm and the Torso).
As you can see from this photo the axe is taller than an average human model:
Its roughly the same length as the height of a wraithguard:
Both the axes are the same size
btw - hope that helps