This is a couple of videos I did a while back that shows some of the process of drilling the holes and doing the stitching for some sheaths. I had been using a carbide stem for the drilling but it found a new home somewhere on the shed floor so replaced it with the reversed drill bit that I use now.
https://www.youtube.com/watch?v=rTSn-nQFsqI&feature=youtu.be

A bit of stitching and includes sticking myself with one of the needles even though they are round ended they still bite if gripped hard enough the wrong way.
https://www.youtube.com/watch?v=o2zUEJBXiMk&feature=youtu.be

finishing off the bottom end of the stitching
https://www.youtube.com/watch?v=PZqGOdP5TzU&feature=youtu.be

And hot waxing for the larger sheaths
https://www.youtube.com/watch?v=r2jzIUNzWV0&feature=youtu.be