Rubik's Magnetic Cube prototype: A plus

You can really see how inexact the cubes are in this shot. Look at the one on the left - it's a rhombus, with a climbing left top corner, and the top face is no better. The right one is slightly trapezoidal, and the bottom is clearly a bit undersized. Ah well - they still look pretty if you aren't glaring in close proximity, and the overall result works fine as intended.

Done