Different products, same concept. Translucent IL buttons combined with black centers, Paradise Arcade Shop's IL-lumination RGB LEDs, LEDs powered by 2 PACLED64s, custom harnesses by me.
-Underside-
Controls wired, RGB LEDs ready for LED harnesses but LED harnesses not installed.

LED harnesses half done.

LED harnesses done.

LED harnesses installed.

With heat shrink over button barrels to prevent light bleeding.

-Topside-
Off.

Running the startup animation.
MK3 layout before light bleeding remedy.

After light bleeding remedy.

You shouldn't have any light bleeding problems with a wooden control panel though. I've got around 100' of 22 gauge wire in each panel, including control wiring, and that's only to the cab bulkhead, much more wiring inside the cab running to where I have my controllers mounted. Six wires for each button, four of which are for the RGBs. I've used around 700' of wire for the whole cab so far, but I went over board with wiring.

You'll use much less wire if you mount your LED controller(s) and interface board close to your controls.
For planning, easiest thing would be to print out your CP pattern and draw lines were you want your wires to run and use it as a "road map" while you're wiring. Me, I made my harnesses with one connector installed and the length being a little longer than my longest wire needed to be, then I cut the rest of the wires to length as I was installing the harnesses.
ETA: If you're going to have RGB LEDs and an LED controller, wire them up so it all works how you eventually want it to from the get-go. Otherwise you'll be re-wiring which is never fun.