If you want to talk about sex(y) and dream conversions, how about this
little, or not, gem that Ferrari build.  This flat-12 engine sits on top of
the gearbox.  It's not a true boxer, despite the name, but rather it is a
180-degree V12.

http://www.512bbi.com/engine-photos/

With a slight amount of clearancing I'm sure it could be eventually made to
fit in the Vanagon.  You'd have to give up the back seat, but you could put
a permanent bed on top of the engine hump. The exhaust routing would not be
an issue and you would gain trunk space where the WBX now sits.  You would
also travel with a permanent grin as this baby sounds intoxicating when it
is winding through the gears.

Let's build a Vanarri.  Anyone?  I'll help!

--
Chris S.
Disclaimer: "Death and serious injury may occur"