For the base is is pretty open ended on what you would like to do. For mine I simply used a PCB (or glued PCB together) to solder my cube to. Once i had my cube done i soldered wires from each column to a resistor. Each resistor was connected to another wire that i planed to plug the Arduino into. You will also need a wire soldered of each layer allowing for negative control (no resistor needed). You can make this part look alot better than mine but for time reasons i just soldered it up quick.