Ok maybe these are dumb assed questions, but I have not see them addressed in this thread and I think it applies.
1. What is used to build the Cages in NASCAR, Indy Cars and Funny Cars?
I have seen video of all three of these crash/hit walls, roll, tumble and the car discentrates, but the driver (Who by the way was wearing a Helmet and a Five Point Belt) get out and walk away under their own power.
Yes I believe a part of that life saving cage is the proper design, but that still must be coupled with the proper materials and quality welds.
2.The accident that spawned this thread was extreme to say the least, so should we all be building cages for this extreme or for the much more normal slow speed flops and rolls that we encounter?
Myself, I think building for the extreme is too much over kill for the wheeling I have seen here in WA and UT, but if your going to get into Racing like Pook is doing or like King of the Hammers, then I think the extreme is the correct cage build to go with.
I also would suspect that Jason C (of S&N Fab) has done more then a little research into this area prior to building their first Chassis, so what he says carries a bit more weight then any backyard fab (at least with me).