alot more pixels (Maybe 864) and also want the pixels to be brighter, so i would need maybe 5 RGB LEDs for each pixel.
You will have 86435 LEDs in that case. That's 12,960 LEDs. If you want to supple 20mA to each on, you're looking at about 260 amps.
I think you will find the power requirements far more daunting than anything else.