I am in awe of many of the leather workers on this forum who have posted pictures of there work, however it has not deterred me from having a go and I have made a variety of sheaths in various ways including hand sewing which I am not very good at and rivetting. Folding over and rivetting is very effective in that if the rivets are on the the side where the edge goes, it prevents what would otherwise be the stitching from being cut. If I have soft leather and I want something a little rigid, then I use carboard inside waterproofed and stiffened with varnish, well why not, I have never been taught the proper way to do things so I experiment. I have made wet form pouches for tobacco tins, and generally I have wet formed them after I have stitched them.