Generally, the answer to your question is: Avoid.
Here's why. As a gunsmith, you can either do five of a common project (let's say 1911 beavertails) to maybe *one* "project" like this.
What makes the most sense for the economic survival of your business?
Oh you'll get people requesting these projects for sure. How about a bolt for a Model 70? A $1000 part in a $700 rifle- think you'll get a yes from the customer? In my experience, as soon as you flatly tell them in multiples of hundreds what their fantasy project will cost, they stop being so nice.
How much is that CNC mill? What are the monthly payments? What is it costing you by the hour? What other projects can I run instead of this *one*?