Well, I have made a belt holster. Its not screen accurate, but it does work and is pretty strong. I havent bothered doing anything with it since I am more of a stickler for accuracy, but it should be pretty easy for you to drill holes into it to add rivets if you want.
I JUST uploaded it, so there may be some shenanigans with thingaverse that keeps it from being downloadable immediately, but here is the link:
https://www.thingiverse.com/thing:3106435 Should have everything you need to make it functional.