Tips and question about KH caliper crossover lines

I did a whole car with the nickel copper lines once. The problem is it gets harder the more you bend it, and the long runs came coiled up so every inch was bent at least twice just in straightening it out. Basically had one chance to get each curve right, after that it was like solid steel.

Fwiw, if the tube work hardens I'm pretty sure you can soften it again with just enough heat to make the color slightly change.