I found this on the web a LOOOONG time ago while looking for some ideas and tips. (I often check other custom toy related sites for these purposes)

Recently, I was given a tip on who may have done this picture and have since contacted him and updated this page. 

Although its clearly a Star Wars Custom, it does use a Hiss Tank and I thought that someone else out there may be inspired to create something similar for the Joes.  And besides....how often do you see a 1983 Hiss Tank not in its true form? :)  (lets hope its the 1983 Hiss, and not the Sears Exclusive Crimson Tank)