A motor vehicle includes a frame body defining a cabin area and an engine area. The engine area is primarily accessible from the cabin area during installation of the engine assembly. A seat frame is removably attached to the frame body in the cabin area, and a seat assembly is removably attached to the seat frame. A method of installing the engine assembly during the assembly of the motor vehicle includes the steps of lowering the engine assembly into the cabin area of the frame body, moving the engine assembly along a longitudinal axis into the engine area of the frame body, lowering the engine assembly onto an engine mount in the engine area of the frame body, attaching the seat frame to the frame body in the cabin area, and attaching the seat assembly to the seat frame.