Well the original designes for the cube itsself are based of of the build instructions for sparkfuns 3x3x3 rgb led matrix, however the build designs were modified heavily so no patent infringing 
the modifications were to add simplification and ridigidity (spelling?) which was not present before so the cube is farely ruggid in that it bends and deforms ( im gonna make a plexi box) the construction is that the top two layers are actually stacked ontop of the first and the leads for the leds themselves actually become the structure , and the base is made shield style with 2 layers of perf board, one to orginise the wires and the other to link them to their pins on the board, it uses a pot for the selecting and a button to confirm, all 19 pins are used in v2 (current) but v3 will be changed so that it frees up about 4 or 5 extra pins (say seperate controls for the other players ) when the schematic is finished i will post it and the pics/ vid
Also for those who think i spent a fortune on the rgb leds, i dident , i got them from a chinese company that manufacturers them, they sell in packs of 100 for about 17 dollars, normal leds of any color or IR OR UV are also sold in packs of 100 but are usually under 2-4 dollars, the shipping is a bit steep but it is well worth it, the comapany is sure electronics btw they speak engrish