Background
The Schwere Wehrmachtschlepper (SWS) was a heavy half track manufactured by Bussing-NAG and Tatra from December, 1943 to March, 1945. To streamline production, the SWS was simple to produce when compared to the Sdkfz 251 series. Approximately 825 were built. Beginning in mid-1944, an armored cab version was introduced and utilized for mobile flak guns. While this vehicle may not qualify as a paper panzer, it’s pretty close. I found one very fuzzy photograph on line, so it did exist; however there are no production figures for the variant depicted in this kit and so one can only assume that the numbers were low.