Interior of the tank seems to be bare metal. As it is, I'll be zinc plating the filler neck. I don't know what I can use on the interior of the tank that can stand up to ethanol, so I'll go bare for now.
As for the availability of Interstate tanks, I would suggest contacting your Norton supplier to see if there is a list. If the manufacturer were to get, say, 50 requests, he may make another style available.