No concerns other than thin barrels do dent easily. They just passed proof so what more "proff" of fitness to shoot could you get. On a personal note I want those thin areas far away from my face and hands. The last ten inches is fine.

As to resale issues you can't sell a Damascus barreled gun to anyone who does not understand them. A educated buyer, who knows where a barrel is thin will make a judgement call if he wants to buy the gun. You just give them the facts, barrels this thick and passed proof at this time. A few won't buy but many would.