The front bit is a single magnesium casting.
The rest are thick aluminium tubes. I’d bet a lot of dollars on this being better at side impact testing than a Volvo. Front impact will probably result in a burning magnesium front subframe though. Rear impact will also result in a fire because that’s where the engine is located.
Props for correctly identifying the car without google image lookup.
EDIT, some more photos of the Alfa Tipo 33 Stradale with the drivetrain out, kindly supplied by