Fitting a fridge into a camper?

I have a Electrolux REM212F fridge to fit in my camper.

As the installation instructions are dated 1984, is it still permissable to fit using internal ventilation as opposed to external ventilation?

I know the burner flue has to be vented outside irrespective of the ventilation method used. but internal ventilation will negate the need to cut big holes in the side of my van for the inlet and outlet grilles.

Cheers