Thinking this is the list:

https://www.amazon.com/Cable-Matters-DisplayPort-Feet-Resolution/dp/B06Y1QP9FV/ref=sr_1_3?keywords=15ft+displayport&qid=1561998949&s=electronics&sr=1-3#customerReviews

https://www.amazon.com/DisplayPort-Signal-Booster-Video-Amplifier/dp/B01IE3IAIS/ref=sr_1_3?keywords=4k+displayport+repeater&qid=1561996275&s=gateway&sr=8-3

https://www.amazon.com/Cable-Matters-Active-Extension-Female/dp/B00DMFB5OK/ref=sr_1_4?keywords=active+usb+3+extension+15ft&qid=1561999021&s=electronics&sr=1-4

Look good you think?

I have the Pimax 8k, and I have almost an identical setup as you.

I am daisy-chaining the 10-foot and 6-foot version of these cables for a total of 16 additional feet (on top of the original Pimax cable). It works perfectly.

For the USB cable, I'm using this extension from my PC to the Vive Link Box (with the original USB cable that came with the Vive). I'm then plugging the Pimax into the USB port of the Vive link box. It also works perfectly.

With all this put together, I have approximately 31 feet total for the video extension, and 30 feet total for the USB extension. I've never had connection troubles, no snow or image problems, and I've never dropped connection.