Main Body Parts:
clear cassette tapes sealed with screws
7/16th in dowel
paint (enough to make the box and dowel the same color)
picture hanging hardware
scrap piece wood
3m el wire 3m any color
battery-powered el inverter
small philips screw driver
drill and drill bits
hot glue gun
Optional Parts and Tools:
Step 1: Cassette Preparation
Using a small screwdriver, free the two sides of the cassette from the inner guts. Do not lose the screws.
The EL wire should fit easily within the body of the tape but prolly won't pass through the lower channel where the tape read head would be. Use pliers to pick off pieces of plastic until the wire will fit through. See the third image.
There also needs to be a path for the el wire to enter the back of the cassette. For this, use a small hobby saw and pliers to cut a chunk out near one of the round openings. A small knife may work as well, but be careful as styrene plastic is brittle and will crack. Be sure only to do this to the back of each cassette.
Optional Step: Removing the cassette labels
I intentionally picked bad music so the labels had to go. There are a few ways to do this but I settled on scuffing the labels off then polishing the plastic. Scratch the tape with 000 steel wool or progressively fine grades of wet sandpaper (400, 600, then 1500?).
Afterwards, the surface of the tape will be dull and opaque. See image 5. Use plastic polish to brighten it up. I used a Flitz branc polish which looked and smelled like toothpaste. Instructions on the bottle will probably include: clean, apply, polish with a cloth, repeat.