They overtightened every bolt in the chassis, by exactly 15lbs. If it were a Camry, that wouldn't matter, but on a track with a car that can go around a 90 degree turn at >120mph, that's a big deal. The bolts (titanium) are stronger than the aluminum supports and braces, so since the bolts won't break and there's too much stress... well, you get the rest. We stripped it down to the tub and then put it all back together to the correct spec, and that fixed the breakage and bending problems (it was the suspension braces that kept breaking), but it still wouldn't hold a wheel alignment and it just felt a little "wrong", also the tires weren't wearing properly. So we fiddled, tweaked, and fiddled some more, and then finally took it apart and went over it with a ruler and a laser level. AHA! The tub is nearly 12mm off square. That sounds like nothing, but if its wrong, everything is wrong, because everything is directly affected by it. We were like "Yay! We know what it is! Oh s***. That's the most important part of the chassis and it can't adjusted because it's all one piece." You can't just order a replacement, it IS the car.
Calling their workshop a "factory" is probably being a little generous. There's zero automation involved, everything is either handmade there or handmade by a 3rd party. That gives each car a unique feel and allows for a level of detail and customization that you can't get from machines. It also creates a greater likelihood for there to be human error. They're like vintage Ferraris, Alfas, and Lancias, if you got a great one, it was bulletproof, a car above all others, if you didn't... well, it might just be bad enough to make you start hating the brand (see the story of how Lamborghini came into being).
I'm not going to speculate too much about what happened, I don't exactly know, but I'd say that one problem exacerbated the other and it all started a nasty cascade. I'm not sure if other cars might have similar problems (I kinda doubt it), but most aren't actually driven, except when they're shown off in public at low speeds, and only a handful will ever have more than 10k kms put on them. They're largely treated as trophy cars, so we may never know.