I have thought about it a bit a few times but I have not sat down and really looked at it. I have the d20 pdfs and most of the Savage Worlds books for it (the Reloaded version).
For one thing the firarms rules need to be looked at more closely. I was thinking of waiting until the Technology book for Pathfinder is out and see what it brought to the table before I mess with rules of my own.
d20 Modern had some firearms rules but I would rather use the Pathfinder core instead of the Pathfinderized Modern that I have seen some people use. I never liked the first Modern. I think that it generified the game, and I felt that it took the good out of the d20 system -- if you want a more generified system play GURPS or Savage Worlds.
The Cartomancer class by Interjection games would be cool for the Huckster.