C/L:

Personally, I'c cut them up for use as reinforcement. The aramid (Kevlar) cord is almost as strong as carbon fiber, and since you have it already, it's a lot cheaper.

I tried fabric lines a long time ago on 1/2A, and didn't like the feel of them there. I can't imagine an 80mph plane with the slow control response they gave on the little planes. But the aramid cord might not be as "Stretchy feeling," do as you wish. I wouldn't even think of flying with them.

Bill.