Thanks guys a lot of my questions have been answered or at least addressed. I still think padding is a good idea no matter how much clearance you have or how well the seat containes you. Video shows much more than the two or three inches of head movement in many different instances. The belts stretching, forces, sudden changes of direction and all are really much to be considered, These cars act as a whip on your neck.

One more question, Would taking the seat and forming it to where your in a slightly laid back possition help? In both clearance issues and sitting deeper in the seat. Take the the whole seat and slightly tilt it back. Should lower the driver a couple inches in the car. I know the whole cockpit idea is to sit upright but I just wonder if a slight redesign might help?

Just ideas and certainly its entirely possible it is worse than better and should be tested before implementing but I've seen the concept in lots of other aplications.

Chuck