This is a brick built Rubik's Cube (6x6) with 2x2 tiles as the colored squares.
The cube is semi functional and 3 of the sections twist along one axis (as seen below).
The scale is almost 1:1 with the original but it's 1/8" smaller
Very good! A real Rubik's cube is black with coloured stickers so I think that by using the 6 sided lego die as a 2x2 block would make it look even more realistic. Problem is that the scale would probably turn out slightly bigger than the real thing.