Something else that you may want to try which was suggested to me by someone here on the forums...get some of that elastic bandage wrap like they use in a doctor's office to wrap you after they stick you with a needle. Get it in a 1 inch width and use it to wrap your tool handle to make the stem of the tool fatter and easier to grip. It is also less tiring on the fingers. I am here to tell you that it works great for me. You can find that elastic wrap at any pharmacy chain store. Good luck
Al Stohlman's book on making holsters is very helpful for learning how to make your own patterns
https://www.amazon.com/s/?ie=UTF8&keywords=how+to+make+holsters+al+stohlman&tag=googhydr-20&index=aps&hvadid=241925047876&hvpos=1t2&hvnetw=s&hvrand=11225605738372491397&hvpone=&hvptwo=&hvqmt=b&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9028613&hvtargid=kwd-125179749206&ref=pd_sl_8bprjiugft_b
If I were going to do something like that, I would just cover an existing case with leather. With a soft case you could actually sew the leather to the case itself...just an idea which you may have already thought about
Good job sir! I like it. Did you buy the snake skin or harvest it yourself? I am thinking about some diamond back skin for a project myself. I like the way the rattle is incorporated into the bottom of the sheath. The Sweetwater Rattlesnake roundup is coming up soon so I may mosey over and see about buying some snake skins if they aren't too pricey.