The Möbelwagen prototype with 2cm quadruple anti-aircraft gun, constructed in 1943, was the first German anti-aircraft tank based on the Panzer IV hull. Only one example was built. An improved version with a 37mm Flak was taken into production and several more advanced models like the Wirbelwind, the Ostwind and the Kugelblitz followed quickly in the last months of WW2.
The prototype Möbelwagen is well photographed and I used these pictures to convert an old Esci Wirbelwind kit into this vehicle. If you are interested you can follow the whole build here.