A year ago I made a replica Wybie mask from the film version of Coraline. While I believe the original prop was designed from a 1950's welding mask, I started with a very similarly shaped industrial face shield, with the clear plastic replaced with thick black sintra. The side crank is a replica replacement Porsche window crank.
I stenciled the skull pattern on the front then painted it in, leaving the welding mask rectangle gap. The original prop was designed to look like a camera three lens turret, which I could not afford to pillage, even from the depths of ebay. I created a replica turret with more sintra, PVC fittings and paint. I wanted the crank to spin the turret, but I realized that since the original prop was from a stop motion film, it didn't have to spin, so neither did mine.
With it all assembled I wired in some green ultra bright LEDs and it looked great. I made plastic lens diffusers out of some packaging plastic, sanded to turn the LED dots into glowing lights.
One year I will actually wear this for Halloween. I have used it as part of the 52 Weeks of Video project, when I featured it in a short, surreal film.