I've been searching for the same thing.
I have a '67, and would also like a replica lid for my little cars.
Your best bet is to get one of those 'toys' off of ebay, and convert the body over.
I've been breathing down pro-line, parma, and everyone's neck to manufacture such a beast, but all I get is :nope:
I have heard of a company out in Austrialia who makes a Holden body, but we all know, they aren't even close.
The only lexan goat I have seen was an old, abused, '67 GTO or Tempest body in a parts lot.
I bugged the hell out of the seller to part with it, but by the time he had gotten back to me, he sold it all, and wouldnt let me know to whom.
Maybe if we get enough guys around with the same goal, -and flood pro-line, parma, etc,- with e-mails requesting such a body, we just might get an answer.
There is a company taking a step into the right direction though.
Its a '66 Chevy Nova.
More info available at
http://www.rcjimsplace.com/invision/index.php?act=ST&f=5&t=9129&
By the way, do you have any pics of your Dads Judge?