Feather Setup

Power comes in through the screw terminal and passes through the on/off switch, then splits to go to the Feather (via the JST port) and also to the LEDs. This is a safer way to power a large number of lights, since it doesn't pull all the power the lights require through the delicate electronics in the Feather.

NeoPixel Setup

+5v goes to the red power wire and G goes to the black wire. The DI pin goes to pin 12, though you can use any GPIO pin here. Just be sure to select the correct pin number in WLED setup. 

I've used four 1/2m strips of pixels, with a short "bend point" soldered between the first and last two, and an 8" strand of wire between the middle two. The first two will go on the front of the illusion and the last two will go on the back, so the wire in between should be enough to reach from one side of your enclosure to the other.