Boat does still exist, was recently sold on evil bay. was located not far from your place, in Gippsland.
I showed my Dad the photo of it on ebay, he just laughed and said it looked just the same when he sold it 25 years ago.
http://s673.photobucket.com/albums/...on=view&current=1413lottsofluck2.jpg

But yes you are right something would have to of been changed in that time.