Just to make sure.......... you are aware that the folding bed from a 78 Westfalia Berlin needs the fridge/icebox on the left side for support so you'll need it for at least the cabinet as well. What's wrong with the Riviera bed mechanism in yours?, if it's the 50/50 split one you won't find anything cooler, those are awesome.
I've got beds from various Westfalias, PM me if that's the route you want to go.