Just an update: I am currently working with modeling putty to lengthen the barrel of the Colt Navy revolver to the full 9" that the original Paterson had. I have my trusty Dremel and have been shaving down and shaping the body and will try to have some nice photos of the WIP soon.
EDIT!!!!!!: Well, luck has just changed on me. I actually FOUND a Pietta for sale and have bought it. XD Color me thrilled. I will be talking to my friend Kristi, who does a lot of 3-D work and mold casting, about what steps I need to take from here to make a casting of it in resin. Afterall, I'm paying an arm and a leg for this thing so I don't want to carve up the original. I'll be casting a resin version and then carving in the etched details with my dremel.
Question for all you who know more than me though...I have read two different things about the barrel length. There's some saying it's 9" and some who say 7 1/2". The gun I just bought is 7 1/2" which is normal for the Pietta replicas from what I understand and from the screenshots I've seen it looks like they were using a replica that had the 7 1/2" barrel. Can someone tell me if I'm wrong on that? If it IS supposed to be 9", I want to stay true to what's in the show and would have to build out an extra 2 inches to the resin casting. Not a HUGE deal but if I can avoid it that's even better. Also, I'm thinking about trying to cast the resin one in pieces so that I can have a working cosplay version.