You know the more I think about it, this is no different(To me) than say ornately carving a Rifle stock, or engraving all the hardware. It’s taking a rifle to the next level.
I’ve been working on cars/welding all my life, and metal is an easier medium for me to work with, rather than wood.
If I find a good cheap barrel to practice on I might try it. I guess I could buy a piece of solid octagon stock but it would be pretty silly if it came out nice with no hole to shoot it with.