Sturmgeschütz neuer Art mit 7.5 cm PaK L/48 auf Fahrgestell Panzerkampfwagen IV (SdKfz 162): Specifications originated in 1942 calling for a heavy assault gun with 100 mm armor. Guderian was against the project as it took away from the PzKpfw IV tanks. A wooden model, made by Vomag Betriebs of Plauen/Vogtland, was shown to Hitler on May 14, 1943 and a soft steel model was presented to Hitler in October 1943. The final prototype was made in December 1943. In June 1944 Hitler ordered production of the PzKpfw IV should be abandoned to concentrate on the Jagdpanzer IV.