I've thought for a long time that this would be a great science mission for a manned lunar landing or a series of them. This is probably something too complex a

I've thought for a long time that this would be a great science mission for a manned lunar landing or a series of them. This is probably something too complex and large to robotically assemble on the Moon, and a human mission could also use in-situ lunar resources (e.g. lunar concrete) to help build such a thing. You could build a massive telescope up there that would be able to outperform anything we currently have by many factors. Even better would be an array of them precisely positioned and bound together. I wonder how big you'd have to go to actually see exoplanets? Wow.