From what I remember, they need absolutely crazy tight tolerances in every single join and gap. Something like <0.1mm for every component involved in the react

From what I remember, they need absolutely crazy tight tolerances in every single join and gap. Something like <0.1mm for every component involved in the reaction chamber. And it's huge too. Otherwise the whole thing will start falling apart as soon as they turn it on. I imagine that's what's requiring the unusual build mechanisms.