Well, I picked up some of the braided PTFE cables, and am using them, suitably undone, as test leads, as they do have a reasonable amount of copper in them. Not too flexible, but fine for power supply use.
Did use the Van Del Hul as interconnects, but they are no different to the others, except they are much better shielded than the original cheap came with cables, which came as about 5 strands of possibly wire for inner, and 3 strands of almost metal as braid, not even foil wrapped. Just had to resolder the dry joints on them, they rely on solder to provide mechanical support and contact for the inner core.