This is very easy to assemble. The instructions are simple and the clues warn which parts can break. The kit comes with extra parts in case that happens, but other than the accordion and the wooden railing around the base, nothing broke when I built it. After assembling, it's fun, but it's easy to see that it can easily fail. The instructions tell you to test the gears along the way so you can catch any glitches before you go too far. When it comes to the smallest gears, I would suggest that you grind and wax them a lot more than you would expect. While you can test them individually on the first tour of building the tower, this is not possible as uneven weight can cause problems at the top of the aircraft tower. At some point it will surely break. Thin parts and moving parts tend to tilt this way, but there's enough extra detail to work out during the first two breaks. All in all a nice couple of hours. Very zen.
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