I don't have models in koikatsu for most of the tanks.
The B1 interior is a rip of the interior of the Edelweiss from valkyria chronicles.
The ST.Glra line up is done in Gmod and scene with the Crusader III are also in Gmod that's why the lighting is different from normal.
I might be able to model a Hetzer, It's a vary smooth boy. But I suck at blender.