Seat and pad
The real pressing need for the seat is that I needed to gain a tiny bit of extra space inside the SL. I found that riding without the one layer ventisit pad gave me enough extra room but I didn't fit the seat very well. A few pressure points that made riding for more than short while impossible. I built a heavy thick seat so I could remove material to change the shape. At first I just removed a small area where I had issues but after using it for while decided to add the bigger recess for the pad. Simpler and it will fit more than just myself. The recess is one thickness of the ventisit material so it can be used instead of the foam pad.