Can't help you with the "unlined" part. I just bought a few red lined barrels that were used by the Schlafley Brewery in St. Louis for transporting Amber. I am in the same boat as you now, I HATE the red liner. I'm really hoping that I can find a steal on a stainless steel barrel... I can dream right?
Learning the ropes of BBQ, built my first UDS and have a few butts under my belt