Ive been studying pictures of the parts for the monolith, in the picture below, im referring to the rods on the set on the left, they are larger than the set on the right, with regard the crystal, a sheet of flourescent acrylic will do the job, just measure the original crystals individual faces, cut out each section, bevel the edges to the required angle and stick it together with pva glue.
So im after the dimensions of the larger rods on the left not the ones on the right.
Ellis