Below.
bmc  :)
"Faith will move mountains, but you'd better bring a shovel...."

 1.
> driver side, 2. passenger side, 3. sliding door, 4. the rear hatch. Only the
> first two activate the drivers side dome light.

I believe the dome light should come on when any of the 4 doors is opened.

The pantry light does not seem
> wired into the switches either and has no three way setting. What is the idea
> here?

The pantry light is not intended to have a 3-way setting.  You just turn it
on when you want it on.

 Do I have a wiring problem, fuse problem or are the switches wired to
> something else (alarm system?) or nothing?

Someone could have wired them to an alarm system, but it wasn't that way
from the factory.  I would start by checking the switches to ensure they're
getting voltage, then work backwards from there.

 Secondly has anyone with a
> Westfalia ever installed a dome light into the ventilation air channel above
> the sliding door.

Check the archives, this was discussed about 2 months ago.

Also, the PO of my westy installed a cool light next to the pantry light--it
has a dimmer-type switch, and is a "snake light" about 12" long.  At max
brightness, it only draws 5W, but is amazingly bright.  I almost never use
the pantry light--I can have the 5W on for several hours, and never go into
the yellow zone on my main battery, whereas the pantry light will make me go
yellow in about 1 hour or so.

HTH.