get a huntsman green welding visor on ebay for $5.00 (it will run about $10.00 shipped, half the price aof one fromw t-visors.com). search dark green welding visor it will come up. put a piece of paper over the face of your bucket and make a pencil rubbing of the mandibles. use that as your template for cutting the visor. cut it out with scissosrs then glue or chicago screw it in place.
if you have any doubts about it being not dark enough or looking green, check out all te screen accurate boba helmets on this site... its what almost all of them use.