[TeMPOraL]

Yeah, I imagine the latter is closer to the truth. I doubt Elon is spending all his time in CAD software, but I'm pretty sure he talks to people who do and looks at their work, and can meaningfully comment / advise on it.

I've seen the type before. I've personally met one of the guys running Reaction Engines Limited (the Skylon company); I've been on a talk he had for physicists at Rutherfort Appleton Laboratories. He mostly talked big-picture things during the presentation; then on a Q&A session someone asked him about details about the engine, and the guy went into full physics professor mode, explaining the engineering tradeoffs they made in excruciating details.

That's how I imagine Elon too.