At the risk of being "that guy", have you considered doing it yourself? I've cut and crowned as well as cut dovetails with basic tools with no problems. If you're handy you can do it.
I have but I also wanted the action gone through and tuned, especially with the addition of the RPP parts being installed. While I typically would give it a shot given the basics dont seem overly complicated, its just something Id rather spend the money to make sure its done properly. Which is also why Im after a Marlin specific smith to do the work vs any old smith with a lathe.