Brandon I did the bottom seat bolsters, and it definitely made it more comfortable to sit in, but didn't help with containment. And by containment I mean keeping my ass from sliding out like a real bucket seat lol. That part is still limited by the design of the seat, I wonder if there's a way to bolt something on the side of the seat, but it might make it more difficult to exit. I was only able to stuff half the cushions (about 1" thick) and it felt like the leather was about to tear so I didn't over do it. I can understand why you used PVC in the beginning, seems like that would be easier to fit evenly. I doubled up on the side bolsters, so now it secures my mid-section more. Btw, after two weeks driving with this mod, my lower back feels so much better from driving long distance.
http://i154.photobucket.com/albums/s253/blklgt05/280D7F87-C9F4-4692-B214-E36A9C93D1DF_zpskmf5bzaz.jpg
http://i154.photobucket.com/albums/s253/blklgt05/8FD3BE2C-AFBD-40D5-9B11-AF4D78212059_zpsvnolxrie.jpg
Also updated the first post's parts+instructions for anyone else reading this.