I wondered this too, so I started looking at professional snow sculptures. I was paying particularly close attention to the railing and the long steam stack. I didn’t see anything quite like the level of consistency and delicacy on that railing. There’s some unbelievable shapes in the pro sculptures, but those shapes seemed larger than the boat, the general scale of the boat seems comparatively quite small. I’m highly skeptical that snow could be made to do that. Its possible that the pic could be the front yard of like a world class snow sculptor.