I came across this build on Kotaku's Cosplay sub-site:
I'm not sure of the artists age, but she's certainly talented. What does detract from the video (and the general professionalism of her craft) are the intermittent hoots, teenagery-silly grunts, and 'extreme wacky faces!' she interjects into the video. I understand adding some humor or levity, but in general that comes across as very forced, and almost derails the video for me.
Irritating presentation aside, the tools, materials, and procedures for building cosplay are a great resource for anyone considering starting or refining their craft.