If you want a Hawken that looks like the original Hawken, and don't want to spend a ton of money on a custom gun. You only have one option.

Lyman GPR. It comes with a PRB twist of 1-60. Unless you don't want to go all the way traditional. Then you can get the GPH which comes with a 1-32 twist.

You also have the option of getting a spare barrel, and have both.

Warning though. Like the real Hawken. It has the curved butt plate, and it's heavy.