The helmet has holes for the ears to come out of the top. The front of the T-visor will bulge out over the muzzle and teeth. The muzzle will be removable though, so the scary face can show or not show. Moreso, when the helmet is removed, the eyes will glow red (installed Terminator style eyes).
Between the digitigrade stilts, rubber mask with Terminator lenses, and helmet, I won't be able to see well and have to be careful not to fall. I am planning a Pole-arm type weapon to help me get around in busy or bumpy terrain.
The other thing about this costume is when I remove the armor, I can be Jedi Master Voolvif Monn or Lak Sivrak from the cantina, or wear it with my Rebel Pilot gear. I can change out at events and be four different Shistavanens.