The hypothetical question to a hypothetical situation deserves a hypothetical answer. There would be no massive cost. It would be a project affordable by the c

The hypothetical question to a hypothetical situation deserves a hypothetical answer. There would be no massive cost. It would be a project affordable by the curious humans/robots/organizations of The Future. Automation will construction and manage the array, and the civilization building such a structure will be post-scarcity to some extent.