Yeah, I watched that episode of Nose Pickers last week. One of them said, "I'll have to get ahold of our metal guy" Might as well get ready to write out a check for 6-figures.
Suggestion #1, take that rotted POS, mount some new tires then find a climate controlled museum and park it.
Suggestion #2, take plenty pics of the van, cut out the hand painted picture on the side and mount it to a wall along with the pics of the van.
Hello!... (the useless) Rock & Roll Hall of Fame. Are you listening?