=6*6*6- 1/3* bottom area *6- (six small golden pagodas with half length+remaining volume)
= 2 16-2 * ( 1/2 * 6)-{[6 * ( 1/3) * (6 * 1/2) 2 * ( 1/2)]+
1/3*6 triangle area-a cuboid composed of six small triangles with right angles on their sides}
=2 16-36-[9+(6*3 times the square of root number 2)]
= 180-(9+ 108)
= 180- 1 17
=63
Personally, this three-dimensional structure is difficult to construct a thinking three-dimensional figure, and I can't guarantee that it is correct, but it should give you some inspiration.