Some example chassis made by automotive manufacturers and race teams and some useful [but not validated by the author] information about chassis torsional stiffness
Alfa Romeo
Bugatti
Dome "Mother" Chassis
DTM Chassis
Ford GT 2017
GTA Spano
GTM (fibreglass)
Hennessey (by KS Composites)
Honda (CRZ Prototype)
Jaguar XJR-14
(46 kg; 80,000 lbs/deg)
Lexus
Koenigsegg
Pagani
Pilbeam
RUF CTR 2017
Vintech P550
Formula SAE: ETS
Formula SAE: Twin-Tube