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The diameter of the moon is about 3476Km.
Seismic experiments determined the crust to be about 60Km.
The volume of the entire moon would then be 21979 Million Km3.
The 'hollow' portion would be 3476-120Km in diameter.
The 'hollow' volume would be about 19780 Million Km3.
21979 - 19780 = Crust volume of 2199 Million Km3, only about
10% of the mass of a solid moon.
At present orbital speed, a hollow moon would be slingshot into the solar system. Or a hollow moon would have to orbit 90% closer to the earth in order to stay in orbit. And, tides would be 90% smaller than they are now.