Nice! I like it! I'm thinking of doing the same thing for my torch.... Question though, how are you securing the light while on the hand? Are you clipping it off to a wrist lanyard or something? With canister lights, losing the light and handle are not an issue since it's attached by the cord, but with a "hand torch", I could see it possibly slipping off the hand and into the abyss.
Thoughts?
I use the same 3D printed model, really like it. I have a compass bungeed behind the light that I clip to in case of failure. I really need to change out the screws for butterfly nuts (so I can adjust on the fly), but it's very comfortable. I've used it on the last 12 dives or so, no issues. It almost might as well not be there.