Shapeways 3D print shop is full of special parts that can be 3D printed on request or downloaded and printed for free with your own 3D printer. Element RC just uploaded the Engine Parts and Radiator to customize you scaler.
Designed to be modular so that it can be customized, the engine is symmetric with both left and right halves of the motor and servo winch can be used with no modification.
The engine cover is designed to work with solid axle trucks. Components are designed to be lightweight so that it does not negatively affect the chassis CG.