Thanks for the inspiration! I was sweating paying over $100 for a kit but this is perfect! I changed mine up a bit from your original design by cutting, drilling and bending some flat steel I had laying around to hold the tubes. I hollowed out 2 extra RJ-11 jacks and glued them to make an error box. I also added a variable resistor so I can dim the LEDs (which was more of a fun thing than a necessary thing, but I also didn't want my belt to be the brightest part of my costume when out in the dark). I also used a 9v battery setup with a holder in place of the top 2 white resistors (hidden by the gizmo holder) that has an on/off switch built in.
I made my own gizmo holder out of a sheet of leather and some rivets from a pattern I got the same place I got the gizmo image (jairuswhitley.com).
I can't thank you enough for the ideas and inspiration. I always love making my own stuff when possible!