You've got the wrong impression.
I've read every link and every post in this thread more than once.
You don't know it, but I've been on your side of this discussion with others in Pro-Touring cars (typically late 60s American cars that sometimes make it to the race track). I'm the fellow helping to educate them on such issues as belt angles, proper welding, HANS devices, roll-cage design and the like. I've even consulted with Joe Marko at HMS Motorsports on a project dealing with proper seat, cage, and harness locations and fabrication.
Enough of that.
I'm new here (and a new Radical owner) so I've got a lot to learn. I really do appreciate the advice, links, and general discussion. Along with reading this thread, and talking with the guys at HMS, I'm going to attend the Radical Masters event at Sebring and talk with the guys about seats and what they are doing. I'm trying to get as much information as possible about solving my seat problem.
Whatever I decide to do about my seats, I'll post it here, and we can discuss it.
Any links or how-tos are most welcome.
thanks!
John