Well when my child was born I spent a fraught night awake with them during which I reread 'The Magnificent Sven' scenario and promised to myself I'd build The Voltsvagn...8 years later I'm getting around to it! My current WIP photo:
That makes me wonder if someone used a model boiler as a "dolly" of sorts for the original dwarf flame cannon. Not that it'd be required, really. Vertical boilers like that are pretty simple shapes. And so are cannons, really. Maybe "inspiration" is a better term.