Fellow MN guy here. I had a custom built last year and was extremely happy with the local gunsmith that put it together. Since then, I've had a number of friends do the same with great results. He's not fast but does a great job. Keep in touch if you'd like his contact.
Where are some longer ranges?
Grant County has 600yds and New York Mills/Rush Lake has 1,300. I live in the Waconia area so there pretty far away for me. I've heard rumors that Mankato is opening one.