More funky than elegant. I realised when I was tatting the tetrahedron that I was making things unnecessarily difficult for myself in the way I was constructing the cube. It's possible to join on the finger tatted section of the SSSR, but it's fiddly and not strictly necessary for the cube. So here's how I did the cube for the earrings (This is not a substitute for Andres Mancenido's excellent
tutorial, it's an extra guideline to the cube specifically)
R1: 4 beads on back of hand, shuttle tatted *Bead 1-2-2-1, repeat 4 times
R2: 2 beads on hand, side 1 joined to R1, Side 2, shuttle tat, bead in position, side 3 finger tat, bead in position, side 4 finger tat
R3: 1 bead on hand, side 1 joined to R2, side 2 joined to R1, side 3 shuttle tat, bead in position, side 4 finger tat
R4: as for Ring 3, joining to appropriate edges
R5: Side 1, shuttle tat, sides 2 -4 shuttle tat, joining as you go.
R6, shuttle only, joining all sides.
Ok, enough of this now. This is my # 2 for the challenge.