I used Neotech Solid OCC COpper and Silver cables. Experimented with 24 gauge, 26 gauge, even 22 gauge. I found 28 gauge (2 wires per conductor, data + and data- ) to be the best, by far. No shielding at all, outside the stock teflon. For the plugs themselves I tried 4, maybe 5 different sets and, these were by far the cleanest and best sounding. Timbre is perfect.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=usb+b+diy+copper&_sacat=0
I tried all kinds of shielding, but got a more open sound without it.
OCC Copper sounded more natural vs OCC Silver to my ears.
USB Cables make a fattttttt!!!! difference, and anyone telling you otherwise has in all likelihood never tried good quality ones. Solid core to my ears is always the superior cable.
Stranded is only good when you need pliability, like for earphones.
Used cardas solder for everything.
On my cable I don't have any power or grounding wires. They sit empty.
Depending on the DAC you are using, you may or may not need a grounding conductor.