The Markpoon EL kit was soldered up and finished. I didn't get the flat doll house wire mainly due to time and laziness. I figured I could get the stock wires to work and no one sees the inside the of the strap anyways when worn.
To prevent the wires from bulging on the outside of the strap, I just did a simple trick. I glued in a layer from a yogurt container

The soft plastic is flexible and is sandwiched so that the wires don't show.
I laid down a 1" strip of masking tape onto a cut out section from the yogurt container, and cut a flat strip out.
I glued the EL and wire to the outer vinyl using 3M Super 77 which I've used for years in graphic design. The layers of material go:
- Outer white vinyl with hole cut for the EL
- yogurt strip with hole cut for the EL (prevents wire from showing)
- EL glued in (I used CA glue)
- inside piece of vinyl
Even with all these layers, it's no thicker than the V2 strap and still thinner than the HC strap
Completed EL straps and wiring.
Finished the resin ankle buckles. I sanded them, primered and painted them white.
I hot glued in the inverter, switch and battery holder. The wires run along the inside of the strap. *Another trick here is I used "heavy duty" adhesive velcro. The hook side is much thinner than regular velcro and doesn't snag the grey upper of the shoe as easily.
Everything is tucked in nicely inside the hollow ankle buckles.
I've glued on my swooshes on the side (cut from vinyl on this pair).