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All this business of manufacturing large complex structures in a zero-G vaccuum is fantasy.
Salyut 7, Mir, ISS???
Hell, even Hubble would count as large complex structure in space today.
The only thing we know how to build in space is stuff we can pre-fab on the geound and clamp together in orbit, which means no large-volume structures.
Sorry, but there you are some centuries late. Even on Earth, we hardly have any large scale structure (buildings, ships, cars), that is not made of more or less large prefabs. The USA couldn't even afford building their carriers without using 900 ton heavy "prefabs" (called superlifts in ship building. We virtually have no large ship building company since WW2 that does not use superlifts).
Prefabs are a reality, and they are far from unpleasant. The question is rather, how you work with them. The extra work done on ISS and Mir actually shows great that we can indeed do much more stuff in space than just docking modules together. The question is: Do we dare it? As long as we don't try to weld stuff together in space more often than once per decade, we won't solve the few missing problems with getting the needed quality in the welds.
The only way to achieve the possible is to try the impossible.