I finally got my LED's and assembled my cap. It features rigid styrene tubing so the dimensions don't change. I put a 9 Volt battery, on/off switch, and variable resistor in the box. The variable resistor cost exactly the same as a 47 ohm resistor so I chose that. The box clips on any hat with a large paper clip. I filed the LED's flat and its seen great by FreeTrack.
Thanks to the developers of this software. If not for this program being available, I would be stuck using a joystick hat for POV. Now what can I use that Hat Switch for?