No airbags or ABS. Seatbelts and seats are very well made to withstand crashes.
True the front is very well made and designed to absorb energy on impact. The rear is part of the monocoque however so whilst there is also room for energy absorbing in the boot panel area, they are still susceptible to transfer energy to the cabin in the case of a bad shunt from the rear. Side impact is good due to factory protection in the doors (no side bars needed to be added for ADR approval on import).
I doubt the AW11 is any worse than a lot of 80's cars for driver safety, but if you have a bad back I don't expect it would be a pleasant experience being shunted from the rear. Nor would whiplash.
Where the AW11 does shine though, and unfortunately this doesn't appeal well to insurance companies, is it's ability as a handling car to mitigate situations. 4 wheel disc brakes will pull you up quickly before they lock, and the superb handling should get you out of most situations.
If you are concerned about safety, I'd advise you just buy a new car. If you want a sports car from the 80's that embrasses a lot of new sports cars, then the AW11 is for you.