I really like this one, Shawn. Right up my alley. I actually have one planned like it, but with a polished silver nib and ring. I bought M3 aluminum I'm going to try to make a ring with on the finial end of the barrel. They also make an M3 gold that I also bought. Unfortunately, I bought the smaller 5/8" M3, so may not be big enough. I may make a smaller pen to start with.
I'm not sure what the M3 looks like though, not sure if it would match the clip or not. It's pricey, so I'm a bit hesitant to use it for experimentation
.
What I'm planning to do for the ring is make a small tenon for the ring to slip over, then glue the tenon into the barrel, sandwiching the ring, but not relying on it for stability. Hope that makes sense.