It is imagined to be a last ditch effort using whatever was available  (like old Tiger hulls). A quick way to get a heavily armored, up gunned vehicle on the streets for the desperate defense of Berlin. The bulk of the vehicle was drawn in 3D modelling software and printed.

The bricks, music stand, lamp post, plinth and manhole cover were 3d modeled and printed. The concrete was made from cork sheet and putty. The dirt is fine sand and ground up potting soil.

The rear deck and running gear are from an old Academy kit. The suitcase, bucket, jack support and engine crank are were also drawn and printed. The tracks are Fruilmodel. 

The duck and helmets are purchased 3D models. The pan was drawn and printed. 

View of the unpainted 3d print. Also, scratch built cleaning rods and items from a Dragon Tiger kit. Tool clasps are from Aber.

The stairs, brick wall and handrails where drawn and printed. The girl and high heel are purchased 3D models.

It was named after the Erik Larson book. 

The Bison statue is a purchased 3D model. It is similar to one in Berlin's Tiergarten. The plinth was drawn and printed. The other items are from various makers found in the spares box.

Image of the 3D Model. It is designed to be a bolt on superstructure like the Sturm Tiger, but the geometry is similar to the jagd panther. The thick frontal armor, large gun and high capacity of rounds would make it like a mobile pill pox.