Yes, the ships forum often has rigging discussions. However, even though I am a ship builder, I recommend thread for rigging both ships and planes. Regular woven thread is good for WW1, but for something as late as the Stringbag, I would use monofilament. You can color it with magic marker.
I am an advocate of drilling through wings for wing rigging, nipping off thread at surface and touching up surface with a tiny drop of color. Easiest way to tension rigging.