This is the next test Im doing, its running the LEDs on a 3.3v power supply, and possibly running the arduino off the 12v that powers the 3.3v circuit, but probably running on the 5v from the usb, I dunno.
The one Im wiring up actually has 100 ohm resistors, I didnt have any 47 ohm resistors.
The wiring between the shift registers and LEDs looks crazy, but i think it will be easier to solder up.