Not possible.
You have to pull the body off the frame and get a westy shell.

Just kidding- this has been done many times and was discussed a week or 2
ago on this very list.
Try searching the archives (if they work).

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of -
Melissa Puckett
Sent: Sunday, April 09, 2006 9:51 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Turning vanagons into Westies???

Anyone ever think about Taking a vanagon and installing a pop top camper
into it?  Husband is looking for a possible donor rotting out westie  .

Melissa
Millsboro DE
'82 Vanagon