I am in the process of making 3 such rigs up.
A BK2 that was beadblasted had custom black micarta handles put on it and thumb serations, replaced the screws with pins. A knife from Flatgrinder here on the forums, he called it a sharpened prybar. And a Tops Tracker.
The Tracker is being bead blast and reground to a more knifelike edge and the flatgrinder one is being beadblasted.
Those two knives are out being modified and the one that is done is out getting a custom sheath. The sheaths for the Tracker and Sharpened prybar are being modified by the same maker as well.
Each sheath will be leather and will have removeable belt loop, D-ring and Dangler, 2 Piggypack straps, firesteel loop, a pouch that will hold an altoids sized tin and tie downs.
I can wear them on belt vertically or horizontally or lower with the dangler or use the piggy back strops to mount them to a thigh rig.
Why 3? Well I am terrible at sharpening knives. I suck at it, I can get a functional egde but thats it. So my plan is to use one and when it gets dull put it aside and use the next one. Since they will all have micarta handles and beadblasted finishes when they are all dull and grimy I can take them to my handy dandy neigborhood knifemaker and he can put em in the booth blast em again and then sharpen them and they will be like new and ready for another go round.
I will be sure to post pics when everything is back from the craftsmen and finished but here's what I have so far, Also a pic of the thigh rig I am talking about: