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.