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“The bomb itself was a crazy looking thing,” he [set designer Julian Crouch] said. “Most bombs are honed through technology, but the atomic bomb was incredibly homemade. It was like a one-off. They weren’t mass producing at this stage, anyway. They used things like Scotch tape to tape things in. It’s insane. It looks crazy. It’ll come down and people will think it’s an exaggeration but it’s not, it’s absolutely an insane looking thing, like science fiction, like someone’s brain with wires all over it.”
There is no attempt to "explain" Oppenheimer or render him in simplistic terms. However, Robert Oppenheimer, the actual physicist, famously disliked opera, and was wary of dramatists who over-sentimentalized the story of his life.