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Building a prototype is the easy (and fun) part. Scaling production is much harder. https://www.businessinsider.com/elon-musk-says-building-fact...

I think this is true if the prototype is known to be possible. It's not in the case.

What do you mean it's not known to be possible in this case?

I mean their trying to build something no ones ever built before and may be currently impossible.