Can't believe I missed that! Definitely a custom tank, but at least somewhat similar to the red max in form. I like the slimness of that tank better, but seeing as how I am not able to custom fab a tank, the red max might be my best bet.
That linked bike with the red max tank is nice! It looks like the tank does a similar thing that sinks over the unmodified frame in order to produce a flat line. I can't find anything about what all you have to do in order to swap the tank out for the red max, any advice on what I'd have to do?