Been to quite a few museums in the former DDR, I'll have to work out how to post photos.
LUFTFAHRT-MUSEUM FINOWFURT, Schorfheide nahe Berlin - INFOTHEK is just north of Berlin.
Flugplatzmuseum Cottbus just near Cottbus.
Luftfahrttechnischer Museumsverein Rothenburg e.V north of Cottbus.