Blast-Off Space Rocket: Pumped Up!

There's a lot going on on the card art of this air and water rocket and that's just the bit we can see. There's a powerful looking space plane bottom right, which looks great, but it's the two firing units further up that intrigue me. What are they? Nacelles? They look like they're contained within a gantry of sorts. And I wonder what that craft is behind the toy. There's a hint of Thunderbird 2!…