This Deathstroke mask was designed off of GANKUTSU-O-TAKU wonderful pepakura model in Fusion 360.
This mask was sized to fit an adult male but but do size accordingly.
Below is the link to GANKUTSU-O-TAKU pepakura file. Check out his other wonderful models.
http://gankutsu-o-taku.deviantart.com/art/Deathstroke-Mask-Pepakura-459164793