Which practical engineering challenge, often glossed over in cost estimates, is mentioned as an insurmountable barrier under current terrestrial methods?

Answer

Assembly in the vacuum of space with perfect structural integrity.

The true difficulty lies in the logistics of coordinating the construction of massive components and assembling them in the vacuum of space while maintaining absolute structural integrity across millions of interlocking parts.

Which practical engineering challenge, often glossed over in cost estimates, is mentioned as an insurmountable barrier under current terrestrial methods?

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