I first discovered them during a trip to the UK in 1995. I think that was the same year nick park won an Oscar for his animation work. As for building one you might want to try modifying something that has the same general shape. I have two rocket birdhouses in the garden that are similar to that design. They are available here in the states at most hobby and craft stores. They are made in China and probably sold worldwide. It would be easy to cut one apart to add a motor mount and parachute. An Estes d12 or e12 engine would fly it easily. Balance could be tricky on something that stout. I built a tintin rocket based on a v2 a few years ago and it needed a lot of nose weight to be stable, but it works very well.

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