Hey Evan, are you coming to the next event?? I'm definitely planning on going, assuming my brakes are fixed by then (working on it next weekend.)
You can see for yourself how comfortable the DAD seats are. I was surprised at how nice they are for longer distances, although nothing beats the repadded/leather stock seats in my 76. Those things are amazing.
As far as belts, I think it depends on how you mount them. Mine are mounted where the stock belts were mounted, and I'm not going anywhere with the car upside down...but I agree, if I wreck the car I might as well go out with it...I don't think I could deal with living through that.