I have an add-on poptop assembly for sale in SoCal. It is an ASI brand
from an 85 Vanagon Camper. It is designed to go on a hardtop passenger
Vanagon. It pops straight up. ASI bought passenger vans from VW and made
them into campers in the 70s and 80s. It uses a smaller hole cut into
the center of the roof for standing room when the top is up and for
getting into the upper bed. This photo shows what it looks like with the
top popped.

http://images.thesamba.com/vw/gallery/pix/1039329.jpg

$250 to any Vanagon list member who comes and gets it in the next week
or so.

More info by PM on request.

Mark