Holster arrived yesterday and I immediately started hacking away at it with a pair of diagonal cutters (too lazy to break out the Dremel). I had to remove about an inch of the sight tunnel and adjust the tension to hold the gun, but it works.
The mount is a cheap weaver mount that I chopped an inch off (it's designed for pistol scopes or long tube-style red dots and way too long for an open-emitter style dot). If you use an Allchin or similar mount, you might get away with less butchery.
I haven't actually put the holster on a belt yet. When I was doing this, I had just returned from the gym and was wearing basketball shorts and too lazy to change into something with a belt (see a pattern here?). But, I can tell from the design it'll probably stick out a fair bit. Definitely not a concealment holster, but that's fine because it's going to be a field holster for hunting/camping.
Chris