I have had one similar to that for a few years, I will have to look up where I saw the design. It is a little simpler - a cup hook in the end of a short (6") length of dowel. I guess if you were fancier you could use deer antler. Because the dowel is hardwood, I pre-drilled the hole and then applied epoxy before threading the hook into the dowel. I put a small screw-eye in the other end of the dowel to attach a zinger easily.
The process of releasing the fish is simple, even if it is in the water - keep tension on the fish and with the cup hook facing up, slide it down the tippet into the bend of the hook - lift up the fish hook (and fish) by the bend and the fish falls off the point.
This is the same lift shown in pszy's comment.