It would have to be huge to be seen with telescopes as good as ours. Looking at https://en.wikipedia.org/wiki/List_of_smallest_exoplanets https://en.wikipedia.

It would have to be huge to be seen with telescopes as good as ours. Looking at https://en.wikipedia.org/wiki/List_of_smallest_exoplanets https://en.wikipedia.org/wiki/List_of_smallest_exoplanets: - https://en.wikipedia.org/wiki/SDSS_J1228%2B1040_b https://en.wikipedia.org/wiki/SDSS_J1228%2B1040_b has about 1/1000 the radius of Jupiter, but only could be detected because it’s heavy at 70% of the mass of the sun. - https://en.wikipedia.org/wiki/Kepler-37b https://en.wikipedia.org/wiki/Kepler-37b is larger than the moon. So, it seems we can’t (¿yet?) build such a structure in a way that makes it visible enough. If we let go of the idea that a proposal must be feasible with current tech, here’s an idea: split the sun in two halves, creating a binary star system. Then, merge the two again. Repeat. That should draw attention.