In November 1943, Alkett, GmbH, a major StuG III manufacturer, was bombed as part of the RAF campaign against Berlin, and Alkett's StuG production declined from 255 StuG IIIs in October 1943, to just 24 vehicles in December. In a December 1943 conference, Hitler welcomed the suggestion of taking the StuG III superstructure and mounting it on a Panzer IV chassis to offset the loss of production of the StuG III. This restarted the Sturmgeschütz IV project, which had earlier been considered and rejected. The superstructure of the StuG III Ausf. G was mounted on a Panzer IV chassis 7. The Krupp plant, which did not produce Panzer IIIs, used the Panzer IV chassis with a modified StuG III superstructure, with a box compartment for the driver added. Combat weight was 23 tonnes, lighter than the 23.9 tonnes for the StuG III Ausf. G. On December 16–17, 1943, Hitler was shown the StuG IV, and approved it. To make up for the large deficit in StuG III production, StuG IV production received full support.