i made a keaton mask when i was in high school. i need a camera. still, that blast mask is a suicide bomber. unless u use ur shield and blast, and u will not lose hearts.
In all honesty, I know you say the Stone Mask would have been the simplest, but I do think that this one might have been because the only part that needed certain accuracy would be the skull, which is only painted on. (and you painted it beautifully, I might add. Very accurate as always! )