Heh. It was made by the same person who made all the Potemayo papercrafts (search my post history to find all three).
You can get this one at
http://www.eonet.ne.jp/~terrasse/
Exact url:
http://www.eonet.ne.jp/~terrasse/miku_n.zip
I haven't had a chance to build it yet...
Make sure to read the html file with it; it shows how to switch the face with the .bmp files included with it. You can make it match your signature if you so desire...