Howdy John - great tutorial, but one suggestion if I may.
I had problems with moisture soaking through the leather liner and ending up against the knife - at times causing rust or the sheath shrinking a bit too much well after I thought it was completlely dry (Keith M should remember one of the latter :grumpy: ).
My "solution" is to seal coat the outside of the leather liner with a fast drying polyurethane before attaching the rawhide. Done thoroughly (sometimes takes 2-3 coats, light coats are best) it prevents any moisture seeping through to the inside of the leather liner and it doesn't hurt the leather - something to think about anyway.
Of course then you have to let the rawhide dry completely before adding your outside seal coat - you can't add it while wet.
FWIW - In deference to the Old Ones I use either real old time Spar Varnish or my own homemade linseed oil based varnish for this outer seal coat... it takes longer to dry, but I like it better......
While the dog chews are a source for rawhide, it is cow rawhide which in my experience is much harder to work with than deer, elk, or buffalo - all of the latter can be mail ordered from Moscow Hide and Fur or Eidnes Fur and in the long run are cheaper - both places often have sides/pieces on sale and/or sell slightly damaged hides (holes, slash marks, etc) at a reduced price.