The mask secures to my face with two elastic straps that clip behind my head - it doesn't take much because it's already the right shape to fit perfectly on my face. I pad the edges of the inside with 2mm thick plastazote foam, and paint the inside black to get rid of any lingering fibreglass dust.
I haven't got an image of it yet, but the EL wire threads through the mask in one long strand, and sits with only a little bit of glue in the grooves carved for it. The battery pack is external, just out of shot in the photo (you can see the wire), and on the inside is a small unit with a microphone that causes the EL wire to react to sound, meaning it lights up when you speak!
I instead settle for the metallic look by lightly drybrushing the mask with silver acrylic paint. The black base and texture from the sculpt lend themselves to this, meaning it looks halfway decent!