I think there is some confusion here between engineering and construction.
Engineering can be done with pretty small groups, especially with advanced computing resources and some pre-designed solutions that simply require modification. Engineering is mostly slowed down by outside assistance unless it is usefully skilled.
Construction needs a small amount of management, a cadre of skilled workers, and a lot of relatively unskilled workers. A construction team would still be relatively small and would recruit from local Project or populace to get the additional manpower.
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