>What I need to know is (looking at the same thing in a water-cooled
>Westfalia) whether the rear heater assembly lives on top of the floor of the
>storage compartment, or is the storage compartment floor cut to allow it
>slide around the heater?
>

On a water cooled Westy, the rear heater is mounted the same way as a
water cooled Vanagon...directly on the metal floor.

The seat base wood is cut around the heater.  The front vent area is also cut.

A heater cover box covers everything under the seat, so you have less
storage room.

Perhaps someone can link photos of the rear seat of a water cooled
westy with the cover box installed and with it removed.