Today I shaped the bicep armor. I started with an oval shape and put two elastic bands through it to attach to my arm.
Then I took a second oval and cut out a channel for the LEDs to go into and glued it all together. I made sure to bend the oval to shape to my arm before gluing it all together. It gets a little uncomfortably hot, but a good technique was to strap the bottom bicep layer to my arm first, apply the hot glue to the top layer and smash it on while I was wearing it. This made the glue dry to the curvature of my arm.
Here is the first layer:
And here is the second layer:
And the assembly:
A view of the back elastic straps:
All I need to do now is paint the sucker and wire up the LEDs and glue the diffuser down.