Enlarging action figure heads?

Enlarging action figure heads?
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Custom WorkstationI have found a lot of info on shrinking heads, but nothing substantial on making them bigger. I know custom sculpting is an option, but I was thinking more along the idea of using a 3D printer to scan and enlarge the heads to 12" scale, then to repair any imperfections before casting reproductions for my own use. Is this a possibility, or does this technology even exist? Any other ideas? Any input is welcome.

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Star Trek on eBay
http://www.theengineerguy.com/Products_ ... ng-Resins/
https://m.youtube.com/watch?v=uDry-goiVTY
It basically uses water to expand it. Remember those little toys as kid, like a dinosaur that "grew" by soaking it overnight? Same principle.