I've always been curious about the stuff, but have never purchased any. Do you heat in the oven, with a heat gun, boil it or what, to get it to the point where it is flexible enough to form around the knife? Do you wear gloves to hand-form it around the knife and how long does the 'window of opportunity' remain open to get it formed? Can you re-heat it to continue to work on forming it, or is it a one-shot deal?
BTW, nice sheath guys.....pretty is as pretty does! 
You want all my trade secrets???
I use a heat gun. Yes, the plastic gets so hot that I wear gloves. I use the 'ove glove, actually one on each hand.
Things get very hot, especially the heat coming out of the gun. Basically, I just move the material over the gun until it is supple. Then depending on the type of sheath that I am making, in this case the folded sheath, I fold it over the knife and then insert the knife and kydex in a kydex press. Assuming, I got it right, it is then on to cutting and shaping the design and sanding the edges and polishing them slightly, too. I drill the holes for the rivets and then insert the eyelet rivets and press them in, too.
Yes you can reshape the kydex if you "mess up". The window of opportunity is quick enough where you can't diddle dally and but slow enough where you don't have to be excessively quick. Once in the press, it takes a minute or so to cool enough to hold its new shape. I sometimes have to reheat portions of a sheath to tight loosen the fit on a knife, at these times, I use my fingers and the 'ove glove.
I am still not as skilled as the maker of the Azkwelke sheaths but one day I will be there....I hope.
