>...and wants to give up?

Now there is a word I can't find in my personal dictionary...:)

I'm almost done collecting the data of 2048 normal combinations from my test slabs...

At first sight,it seems you were right on the money with your idea of 240 normals (0-239). The next five indexes change only slightly and once after 244 they don't change anymore.
Sadely I had to redo the whole 2048 values because Will sugested that my choice of the voxel base color was not optimal.(and he was right). I'm almost done with my new series.
Interesting fact:
-The RA2 normals produce 16 RGB shades, so the 15x16 theory seems quit possible. The big question is: what spatial diagram it uses ???