Drumroll 2 is 360mm wide by 420mm long but that's from tip to tail of the armour. Effective size (i.e. where all the parts are) is roughly 250mm wide by 300mm. Drum weighs around 2.1kg, so quite a bit lighter than before but hopefully still with enough inertia to get some good hits. So are those other teeth you posted pictures of on FB for your feather then Tom? Thought they might have been for a beetle.

Boner's drum should be around the 4.2kg mark - it's a beast.