Glad you are enjoying them!
I have to say, 4 square Panels never impressed me much. But, after studying the shape to get this pipe right, I think it may be perhaps the ultimate pipe shape.
The straight billiard is already a perfect pipe functionally, the drilling is a perfectly straight line that allows optimum airflow. The 4 square panel adds to that basic shape aesthetically, it is a handsome and interesting shape, manly looking and rugged. BUT, the design adds strength in all the right places too; the beefy shank, the sterling silver reinforcement around the shank, the extra meat around the corners of the bowl. The 4 flat faces around the bowl allow perfectly even heat radiation. The flat top and bottom of the stem allow a perfect comfortable grip. The flat bottom makes a perfect sitter.
All in all, after making these two, I am personally convinced whoever first came up with the shape may have designed the ultimate classic pipe.