Model based on concept art, 2D assets, and 3D blockout provided by the amazing Lars Sowig:
https://sowig.artstation.com/projects/XB1Km0
http://sowig.net/
For more information, check out his concept design page. :)
Gebaur Störer BLU
Gebaur Störer BLU FIELD
Gebaur Störer ODG
Gebaur Störer ODG FIELD
Gebaur Störer SET