I appreciate the input on the sight. When I first made the staff and the disc attached, I cut a 1/4" hole. This was before I installed the slide adjustment with it's 1/16" hole. With the 1/4" hole in the disc, I was amazed at how clear both the front and rear sight appeared. Another bonus was I had set the front and rear sight in the centre of the barrel, and the diopter aligned them perfectly. This means that I got the tang sight installed dead centre and that the adjustment slide is likely redundant. The rifle is going to Alaska and likely Colorado for big game, and I agree with Dan, that it is likely a smart move to take the diopter off when hunting, to be reserved primarily for target shooting, which is what I believe Sam Hawken had in mind when he designed these pistol grip rifles.
Now to pack harden the hardware, and finish the barrel.