I'm the same way about Furutech. Rhodium connectors are one of the worst conductors, you might as well uses nickel. The difference is nickel/lead RCAs need to be cleaned but is a lot softer. Rhodium is for severe enviro conditions, and it looks pretty. It's WAY to hard on non Rhodium connectors. Red copper or silver over copper. I'd use gold plating over red copper as a 3rd pick. The rest has it's place but never in audio use..
Automotive or heavy equipment, yes.. It's part of my job making cable (s) for just about any mobile or trackable equipment. We use Rhodium around salt or brackish water.
BTW their is a direction on the cable, you have to look at it under a 100-1000x. You'll see how it was pushed through the extrusion dies. That is the single best thing you can do to build your cable. Get the direction right, don't touch the exposed wire with your hands/fingers and use contact enhancers before you tighten the securement screws. Get the thinnest shrink tube you can find and use braided armor. There is a conductive armor that be used in a grounding / shield app. I personally don't use that type of mumbo jumbo. I've used battery packs to check the nulls in cable when it's buried in lattice or 100 feet in the air. It proves there are NO leaks for the lack of a better term. Other than that it's a worthless test as far a sound goes..
Cables are easy to make. Follow the rules and you'll build a BETTER cable than you can buy for 10X the money..