This is an HO scale Tiger based on the Elephant chassis.
It is a mixed media kit of injection molded plastic and resin. This big bump on the back end has to be cut off.
These resin kits are great, but they are fragile and do require a lot of work.
This hull is cast in one part and the large block of resin is due to the use of a vacuum chamber to remove the bubbles. It's an advanced modeller project, but gives a unique vehicle.