There are a couple of builds of Luftwaffe WW2 helicopters in the Unofficial Airfix Modellers Forum Large Scale Planes group build if anyone would like to have a look...
Marek FA-223 Drache
The Unofficial Airfix Modellers' Forum
GPM FL-282 Kolibri
The Unofficial Airfix Modellers' Forum
The build runs for three months so it is likely some other paper models may appear later...