You can also make a Kydex sheath.
Kydex is the stuff that commercial airliners use for interior panels. It is low temperature (about 300 degrees F.) heat formed over a disposable form. The video shows using a griddle. I usually see a toaster oven, or even a kitchen oven. But very easy to form. The form can be made from hardboard, plywood, even cardboard (if only used once). You can fold it and make it from one piece or you can make it from two separate pieces.
Kydex has been adopted by the holster industry because it is easy to form and extremely durable. You can find the sheet in small quantities online. Almost no equipment investment is required. The pull saw is a large piece, so I would probably use the kitchen oven on a low setting. More information is online.
The video shows a left and right piece. You can also make it from a single sheet that has been folded over. If you have a band saw, it is easy to trim the piece after forming. And you can flame-polish the edges for a really nice finish.
Good luck.