Its been done but I'd recommend that you just locate a Westy with a bad
engine and transplant your good engine.
I've got an 81 Westy at a good price that has a strong engine
http://williamwareagency.com/forsale/stanvan/81blue.htm

Stan Wilder

On Sat, 26 Jan 2002 21:12:12 -0800 Mike Lawrence <realthing74@YAHOO.COM>
writes:
> Hello all,
> Can one take a pop-top unit off a wrecked van & put it
> on a non-pop-top & cutout the opening & end up with a
> good pop-top camper?
> Mike
>
> __________________________________________________
> Do You Yahoo!?
> Great stuff seeking new owners in Yahoo! Auctions!
> http://auctions.yahoo.com
>
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