This is the story of a scratch built 1:35 Grille L/16 MORSER BÄR (BEAR) that was build from two different kits, scratch built plastic, and concept of true paper panzer before Trumpeter came out with the recent 1/35 scale Bear model.
This is partial text from the full article (usually with photos) at https://armorama.com/news/1-35-grille-l-16-morser-bar-bear-scratch-built