Yes Bigbore,
I've had two 50alaskans built on marlins. Wild West guns did the first, a copilot takedown in hard chrome finish. Jim West is a pain to work with but the gun came out completely reliable and was accurate. He would be my choice.
The second was built by Noneman, in Missouri. Nice guy and easy to work with but the finished gun had one problem after another. It was never 100% reliable. I did loan that one to a friend that was going to Africa on a elephant cull hunt. He killed a cow elephant with it. I would not use Noneman again.
Regards,