The Green Goblin, much like The Joker, is a very theatrical trickster villain. Only instead of clowns and circus stuff, Goblin's motif is Halloween (which is why he has a Goblin mask, why he uses PUMPKIN bombs, and razor BATS, etc).
That is why I suggested the Goblin mask be made out of a prototype prosthetic making machine/materials that Norman Osborn originally designed to sell to movie studios, stuff that would allow them to cut down their makeup chair time.
It would allow Goblin to have his comic book style mask that allows him to emote with it on. It would also fit the Halloween motif, as it would be a monster movie/horror movie type of mask, as that is what the Goblin would want himself to appear like to the outside world. Which would allow the Goblin to design his look and gear to tie into the Halloween motif even more than previous film incarnations of the character have, and get away from the "militarized" tech style as a way of explaining the character.