Your biggest problem will /maybe getting a 577 barrel.

Rolf trades under Safari Arms if you didn't already know.

And a word of warning.

Give him your instructions IN WRITING, clearly specifying
everything in black and white, especially barrel length.

When he made one of them, he chopped it to 22 inches
when the person wanted 24 inches !!! When asked why,
....... you know where I am going.