I don't know that there would be many designers sharing the original files. But you know about Shapeways, right? There are many hundreds of upgrades on there ranging from heads, guns, wings, etc. they will print fora fee in a range of colours and plastics. Many designers on Tfw2005 sell their work there. Visit Shapeways.com, and there are a few threads about in on the ozformers site
http://www.otca.com.au/boards/showth...ight=Shapeways
On the lookout for MISB Headmaster Highbrow, Takara or Hasbro. I'm sure I could make you a sweet deal!