Full art:

Design:

“The shape and design of its torso is identical to Fire Engine‘s. The design of its head is slightly different”

Back:

Left: “Fire Extinguishing tank”
Right: “Wings for flight”

Shoulders:

Top: “Visualization of the movement of the parts between the shoulders and wings”
Bottom: “Visualization from above”, left: “Shoulder”, right: “Wing connection”

Weapon and legs:

Left: “Fire extinguishing weapon”
Middle: “Additional fuel tank”
Right: “Boosters”

Source.