Project201/ Pz.lllV K.1499 is a heavy weapon test platform based on the Pz.lll chassis. At that time, the relevant students' research topics in the national military university of the country were inclined to explore whether the extreme tank design layout of vehicles such as Fv4005 had any reference significance. Therefore, in 1953, the car was independently completed by the experts, professors and students of the National Military Academy of the country. The tank was equipped with a 150 mm (the actual precise caliber is 149.9 mm, so it is also called Vk.1499) heavy tankgun. It is worth mentioning that there was no problem with the automatic loader of the Fv4005 on this vehicle, because the father of a student who participated in the project was an electrical engineer. The student applied for a patent for a kind of mobile device used in the precision instrument assembly line, but it was not widely adopted. The student and his father jointly used some of the technology of this patent to make the automatic feeding machine of project201 work well. Although the authorities were not very optimistic about the design of the British Fv4005 at that time, they still approved the experimental scheme of the design to match the Fv4005. After testing, its maximum penetration depth can reach 294 mm. The authorities actually think that "Project 201 has great training value," so it is not like other experimental vehicles that only produce one prototype and sink into the sea. There were 13 Project 201s produced and modified for training, military parades, and museum exhibitions. "We also need to have what others have," said Chris Kowalainen, then the general of the Third Armored Army Group.