Heh, so this is basically replacing one model with another, right? Pretty sweet. if you make a tool, I suggest that you also try figuring out where to place the models as well. That, sir, would be epic.
And a model editor? More epic. I'd love to see that. Would help me out a lot for my PkMn XDS project. ._.
As of now, Imma mess around with this. :3