Pine board (section of a 1x12, about 19 inches long)
25 white 5mm LEDs
soldering iron (and solder)
clamps and glue
Step 1: Wooden housing - blade depth
To do this, I first removed the blade guard assembly and lowered the blade so it wouldn't cut all the way through the wood. (My groove was shallow enough that the LEDs are completely contained- if you want them to stick through the holes, you can make a deeper groove with less material remaining.)
Step 2: Wooden Housing - cutting grove
I also cut one a very thin strip of wood that I'll use later to cover the back of the assembly.