This is how I am constructing my belly wires. This is not a complete step by step tutorial but it will get you started. I will likely do a second video showing the finished results.

This design is specific to the Star Wars - A New Hope "Droids for sale" scene, which is one of the first scenes shot for the movie.

As discussed, here are the templates below:

Belly wires template
https://i.ibb.co/pvjJBbT/belly-wires-...

Belly ribbed mat template
https://i.ibb.co/t4BF5PX/belly-mat.jpg