I did a little instruction and a few photos of the build process:
It's impossible to insert one of center pieces to a hole because of printing error (Shapeways' fault). But you can easily correct this by a sharp knife. You should enlarge the hole a bit and cut end of center piece. Or you can make the hole and the "fist" oval (see photo), it's easier for me to fix the details like that. But be careful with using a knife, you can easily cut more than you need! And then the details won't hold up.
[Updated on: Wed, 31 August 2011 13:34 UTC]
grigorusha Living Puzzle Shop: http://www.shapeways.com/shops/grigorusha
my youtube video: http://www.youtube.com/user/grigrme
my photo-stream: http://www.flickr.com/photos/grigorusha