Hi,
how about a Messter Rheinbildner strip camera? This is the essential and defining equipment for the Rubild version of the Rumpler 'CIV' and is not provided in the WNW kit (late). This is odd since they do have the mechanical drive for this at bottom corner of part A31. Also, the kit version I'm intending to build, option 'C' (8037/17) - the one with the lovely Maybug/Cockchafer beetle (not a scarab!), is probably a Rubild as it has the propeller drive unit on the undercarriage.
I've seen photos (one in the Datafile for example) but haven't yet found dimensions.
Just a thought.
Happy new Year!
GrahamB