This was me testing my connection code. The wooden octahedra currently have a range of 8 blocks- note that the iron octahedron on the second wood block at the bottom won't connect to the wooden octahedron nine blocks above it, but the iron octahedron at the middle right will connect to the diamond one down below. Also, the gold octahedra are just a bit too far apart to connect to each other if either is replaced with iron.
They also *should* store their connection information and save it to NBT. They're only programmed to scan for nearby octahedra once every four seconds, so that seems to be working. I don't have any way to test the NBT bit yet, but I will once I implement the power system. Right now, they just make pretty particles.