Wonderbugs. Are they sort after?

Came across a 1971 Wonderbug for sale. Apparently they were only made in the USA. They have (I think) a 1940's Ford Chevy front on them. Does anybody know anything about them? The history? How much are they worth? Are they rare in Australia?
Thanks!!

here is the only references i could find, ive never heard of them
http://www.gatewayclassiccars.com/displaycar.php?stock=3742&location=STL
http://www.aussiefrogs.com/forum/showthread.php?t=4015

there is one in an old australian vw mag somewhere red with a . count me down for one i like em ,have u you got old rego papers with it??

last seen one about 5yr ago in a caryard just off woodville rd ,it was red with flames 40 ford front and if my memory serves me right it was a chop top as well🤪

I've found a link on Ebay. This gives you an idea on what they look like for people who haven't seen them before.

http://cgi.cafr.ebay.ca/Volkswagen-Beetle-Pre-1998-Restored-1967-VW-Beetle-with-Wonderbug-front_W0QQitemZ290151587768QQihZ019QQcategoryZ6019QQcmdZViewItem

Checked out the link to Gateway classics...Im a Cleaning contractor and would be proud to pull up at a job with the Wonder bug van . Very cool in my books. Love the dash

Cheers