Rainwalker makes great sheaths. I just received two from him. If you want top quality, have the money to spend, and aren’t in a hurry, that’s the way to go.
But there’s nothing wrong with the Scrap Yard sheaths. I have the Cordura and the kydex sheaths to fit the Dogfather. They both give good service. I have a Cordura for a Dogfather, and one for a CGFBM. I also have a First Position Kydex for my Dogfather LE.
One unusual point about the First Position Kydex sheaths is that they have open throats. That can be a good thing. Or not. It sure makes is easier to find the sheath with the point of such a long knife. You don’t have to grab the tip of the blade and feel around for the sheath’s opening. On the other hand, I live in rainy country. If I’m wearing a first position sheath belted to my outer layer of clothes, that wide throat acts as a funnel and channels raindrops onto the knife. This is easily fixed by wearing the sheath inside your slicker. But of course you have to open your rain shell every time you need to draw or resheath your Dogfather.
Then again, every time you take your knife out in the rain, it’s going to get wet anyway. Your pays your money and you takes your choice.