I agree w/Tim240Z. I would also like to throw out for everyone's consideration, that aside from a rollbar, subchassis connectors and strut bars, what else can be done to stiffen the unibody in torsion and bending (both horizontally and longitudinally.
I was thinking/hoping of something not as intrusive as a cage in the drivers' area - geared for street - not track.
Is it possible that some shallow c-channel could be applied to good effect as long as the interior is gutted?
Perhaps KatMan might chime in here...