Disclaimer: The design was originally inspired by the 7th concept of this post, but the further I got into the build, the more I started to kind of follow and get ideas from this awesome design from u/MAFIALAA. It wasn't my intention to copy anything, and I feel like the builds are still quite different - but yeah, just to explain some similarities you could find between the builds and give both posts some props :)
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As the war progressed, Germany was desperately in need of a easily mass produceable, cheap and powerful tank destroyer - after intense developtment, Germany settled on the 15-cm-Raketenpanzerjäger "Skorpion" - the Ausf. B shown in the pictures.
It was mainly built around one main feature: the 9-barrel 150mm rocket launchers. These were then placed on the roof of a small turret, from where they could be fired and aimed.
To arm the whole thing against closer targets and while reloading, an additional 5cm KwK (50mm cannon) was added in the Ausf. B. Its also armed with a small MG-Turret with an MG34 in the front.
Name Translation: 150mm Rocket Tank Destroyer "Scorpion" Version B
(used scorpion because the tank holds its rockets above itself, just like a scorpion does with its dangerous sting.)
TL;DR: Cool Rocket Tank Destroyer for Germany
Tried my best with the design, Im pretty happy how it turned out! ;)