It is surely better to construct them here, where we have all our tools, and if really necessary pump them out here. There just isn't an advantage to doing it in space. You end up paying more to create a lower-quality sphere.
And what weighs more - the air that got trapped in the sphere when we made it, or the machine we sent up to space to assemble a sphere there?
And what weighs more - the air that got trapped in the sphere when we made it, or the machine we sent up to space to assemble a sphere there?