NASA Institute for Advanced Concepts symposium has a presentation of the 1000 meter Lunar Crater Radio Telescope (LCRT). It would cover ultra-long-wavelength radio waves that have not been studied before because of noise on earth. It would be the largest filled-aperture radio telescope in the solar system at 1km in diameter. Arecibo is 300 meters in diameter and the FAST telescope is 500 meters in diameter.
It would be a mesh telescope that would be at the bottom of a 3000-5000 meter lunar crater on the far side of the moon.
They have worked out the basics of the construction and operation of the LCRT.

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Looks like the Moon is being used primarily as a shield from Earth noise, rather than a support for a 'scope, which would be easier structure in Space than landing on the Moon, it seems.
Pfft someone give me my PPT moniez for my lunar crater wall LIGO base.
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