Good summary, Richard!
I appreciate, even more, that I have enjoyed my seat for nearly 1,000 miles, especially after reading your summary coupled with my first minimal exploration into seat design/construction. I performed research and learned of Corbin, and others, and the difficulties of using the existing, or a custom, seat pan. I explored a custom seat profile before realizing that it is optimal for long distance flat road cruising and, as you mentioned, can be very heavy and bulky. By selecting the existing seat pan, I was constrained to many factors, including foam build-up and build-out by increasing the back wall angle and width/flatness, and raising the front of the seat where it intersects with the tank. The seat height was raised ~1/2" at the lowest point, and I have long legs that don't mind the additional height. I'll suffer some leather creep/sag as the seat breaks in more, a product of such high-aspect topography.
I've added 2" handlebar risers to assist in my preferred upright position.
The aesthetic component was more personal/subjective and I selected plain black, as opposed to stitched pattern/pleats/rolls/etc, and the ostrich as a contrast-match and bike theme painting.
I've attached a couple of intermediate photos of the seat stack-up.