I built my own for fun and since I know it serves no benefits, I did a dual-run Belden 10ga bi-wire for that garden hose look. For the bananas to fit two of those on the amp end, I used GLS Audio locking banana plugs (which I think are the same as the BJC ones).
Anyhoo, good luck and have fun. BTW, those TechFlex are difficult (for me) to gauge insofar as how long one needs them. The stretching and heat shortens their length quite a bit.
Cheers,
-H