Blau is actually Howard Blau, the guy who commissioned this bike in 1975. The guy who made the tank was Chet Page who built the frame/bodywork for the Action Fours 570 Honda race bikes. This tank in particular is fiberglass and it would probably be impossible to find one of the originals since so few were made. The pictures in the original post are from a November 1975 article in Cycle Magazine.