What's the Name of That Book??? discussion

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King Arthur's Spaceship and Other Marvels That Might Have Changed the World
SOLVED: Children's/YA
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SOLVED. English-language Children's Picture book from the 90s (or earlier) featuring cross-section/ cutaway drawings/ schematics of pseudo-historical vehicles, e.g. Roman submarine, caveman mobile home, Victorian spaceship. [s]
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Thanks for the tip. I was looking at Biesty's books, and although it's a very similar style, they all seem to be real-world present-day or historical (e.g. space shuttles, castles), whereas the book I remember was definitely more fantastical pseudo-history.
1. A caveman mobile home. Literally a giant rock full of caves and pulled by big animals (I think mammoths) on rolling logs. Basically a Flintstones-style thing.
2. A Roman submarine that was like a historical Roman galley with oars, but also a roof so that it could go underwater. I'm 99% sure it was shaped like a seahorse and called the Hippocampus (Latin for seahorse).
3. A Victorian spaceship, powered by coal and a set of gigantic bellows to blow the fire out like a rocket. In other words, a Steampunk spaceship.
If you know the name of this book, please let me know! Thanks in advance.