I do not have any good design softwares so I might just as well use Powerpoint for its design.
The 12.8 cm Selbstfahrlafette mit gerichtetem Fahrzeug was a very obscure tank destroyer design conceived in early 1944. Many interesting details of it were the low profile, high elevation angles and non-existent horizontal traverse angles. It was armed with a 12,8 cm gun made by Rheinmetall, one that failed to compete with Krupp's gun. It hasn't been discussed anywhere else beside
this VK thread by Zinoviy Alexeev and the Secret Projects Forum where I brought it up. Thanks to him for providing me with the drawing needed for this design!
Owing to its obscurity, there are obviously no known models of it. The first draft looks rather rudimentary in my opinion, but improvements will come...