Quick update today.
This is the current state of the second revision of the lightboard. Much neater design, although there's been two mishaps. The first is that I accidentally ordered much too beefy resistors, so they're too big for the initial design and I've been forced to put some of them under the board. The second thing is that the LED-modules were almost twice as big as expected and will be sticking out from the board.
But it's all good, I believe.