BowBoy that's a good looking sheath for the S6 it, looks very secure. I've had a few kydex sheaths made by different people that did not hold the knife securely. That's my main concern the knife being held securely in the sheath.
You might be able to have the Kydex maker put a strap on the sheath. When I rappel (falling steel is not cool for the belay), I use my nylon SpecOps Combat Master sheath.
