I'm looking for a step by step guide on how to make them. Also, how much would I need to invest in the tools needed to make them?
The online tutorial I used is gone, but this is similar.
http://willowhavenoutdoor.com/general-s ... r-kitchen/
For tools, you need a drill, a coping saw(or a power equivalent - sabresaw/jigsaw) and a vise. The vise is optional, I've read about folks standing on the foam until the kydex cools. A file for cleaning up edges is nice, but I suppose you could use a patch of concrete. You'll need something for setting the rivets, a punch of some sort. Mine came in the bag of rivets. The hardest part is juggling everything into the vise in alignment before the kydex cools. It usually takes me a few tries.
I got my supplies, excepting the leather, here:
The dymondwood that they sell makes a great handle. You can work it with hand tools, buff it up, and you're done. Waterproof, won't dry and crack, good looking for every taste from subdued to garish. I did make one from yellow and black. Won't do that again.
The leather at Texas knifemaking isn't dense enough for me. I found a local place that sells something called "horse butt". It's horsehide scrap left over from making saddles. It's really dense and sturdy. They also have waxed linen thread. I think they probably ship.
Leather is pretty easy and takes only a few hand tools. Here's a tutorial. I've made one sheath similar to this one and several horizontal weak-side sheaths set up for cross draw. That's my preference with the Mules, but some of my pants have inconvenient belt loops and I go vertical. I made up my own pattern for the horizontal sheath. If there's interest, I could post a few pics.