Robotism
Is that yellow piping what you're talking about G? I really want to find a Zaku pipe solution. I have a MG HM Zaku I'm really wanting to build but then I remember the pipe rings and it stays unopened. I got sick of those on the Sazabi.
Yes, that's the Kynar wire. However, for a 1/100 scale kit, I think it would be too fine for power cables. I too have searched for a good looking substitute, but so far have no answer. Adler's Nest made precut plastic rings, but they don't really look good when used on a spring or wire. You really need something spherical sandwiched between the rings. Plus some angled rings to accomodate bends are needed.