Hi Scott,
I used the Sonex upholstery in my Xenos (sold) and now my OneX. The fit and finish is excellent. The cushions are approx. 1-1/4" thick and I find them to be very comfortable. In my Xenos I sat directly on the cushion and it felt fine. In my OneX I use a 3 inch booster cushion to get a better view over the panel. Very feneficial for landing! I'm about 6 feet tall.
Here are a couple of pictures. I also use the Sonex baggage compartment sling and it's excellent. I tried to take a picture of it but you don't see too much when viewed through the turtle deck opening.
Let me know if you have any other questions.