Here's a perspective that might help in regard to rationalizing this sort of custom work:
Consider the works of Stradivarius, of violin fame. I only know of one that still exists in it's original state. All the others have been worked and modified. The best sounding ones are the ones that get played a lot. And, they show the wear and tear.

These custom HDs are masterpieces of the gunmaker's art.

Best Regards,
Jim