The toughest job in a build like this has to be getting layered materials to behave, and the maker handled it by going all in on a full Cu-Mai stack: a 52100 core, 1095 outer layers with copper, and a thin bronze jacket over the top. That is four different materials that all need to move together, and doing it without CNC or any mass production makes the result even more impressive to me.
The blade treatment is the part that stands out. The bronze layer is thin enough to sit over the steel without hiding the work underneath, and the maker says it adds extra character to the blade, which I completely agree with based on how the patterning reads on both sides. The stated reasoning for 52100, edge stability, wear resistance, and edge retention, also holds up as a solid core choice in my view.
The handle work is just as considered. The scales are Karelian, or Masur, birch, cut lengthwise from small-diameter trunks so the natural center of the wood runs right through the pin area. The pieces were fitted tightly together and then dyed to bring the grain out. Getting a seamless fit on curly birch seems like real patience to me.
One open question remains: the patterning along the cutting edge, visible when the knife is rotated outdoors, is wavy in a way the maker's notes on the Cu-Mai layering do not explain. Whether that comes from the copper layers or the bronze is something I would love to hear more about.