Yeah, I'd avoid Kydex due to the heat as well. I've had it loosen up on a knife just using it out on the trail. Also, if you take shortcuts with it, which we know is going to happen in this particular case, it won't work as intended. Kydex is supposed to work like a temporary clampy kinda material and if it isn't right and tight, which is about the only thing that has been demonstrated, it is just going to be a waste and then we'll all be called names and trying to critique more shoddy workmanship for naught. There is a learning curve and tooling needed and it doesn't help anyone get better using their sewing machine.