Regarding what type of material to use for rigging, I discovered EZ Line a while back. With a little practice, I found I can achieve good results. I also like that I can accidently touch it and it doesn't snap off.
An alternative that I have been using on some recent models has been used guitar strings (the thin ones).
Years ago I thought I'd learn how to play the guitar. Quickly I learned that I don't have the apptitude to play the guitar. But I did end up with a small collection of used guitar strings. I kept a set because they looked like they might be useful in a future build. I have since used the thin strings to make whip antennas and other pieces that are thin, and often break off the model. The guitar strings are like spring steel, so they bend, and then snap back.
I recently stopped in at our local musical instrument shop and they let me have as many used guitar strings as I wanted, for free. When I told them what I planned on using the strings for they seemed happy that the strings were going to remain useful, instead of ending up in the trash.
So, I'm going to try using the guitar strings for the rigging of the underwing pontoons on a Sunderland flying boat. I'll see if it works. If not, I can easily revert back to EZ Line.
Does anyone know if other stringed instruments have thinner wires than a guitar?