yeah, i think the market for this is small - race guys have cages, and street guys have suspension that is compliant enough to absorb the flex and not transfer it to the chassis; the hot street/ax/track rat is the target.
so, to the engineers (of which i am one, but not my area of expertise) which would provide more rigidity (speaking specifically to the passenger compartment, and more specifically to the four 'wells' in that compartment):
- the engman approach to reinforce the rockers, tunnel, and bulkhead? lots of welding; would be an intrusive job;
- the cross-bracing approach of running diagonal members? could be accomplished with bolt-in brackets and threaded rods or somesuch;
- a combo of one of the above with the addition of welded/bolted gussets in the corners?
- or screw it, just seam weld the car!
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