I stated this earlier.

Ankle Biter:

1) The drum shells out more than 100 KJs, so you need to say how it can survive its own backlash.

2) Id like to know how you got that high a number on a drum anyway.

3) Its massively overweight.

As for the other two, youre using a thickness of Hardox which is unavailable. 3.25 at the very thinnest, but Id suggest changing for a different armour type as thickening the armour any will probably make them go overweight.