Although this was a relatively old airframe, the cargo conversion was quite recent so liability issues would probably still be possible.
When it comes to strapping, the aircraft contains the same Telair cargo loading
and locking system as the factory produced freighter (minus the nose loading/ locking functions) with nearly the full cargo floor structure as well.
So there was no seatrail strapping and the ability to strap to the airframe structure is more defined than with seatrails only.
However it is a science in itself when it comes to overweight loads.
And by the way - no chains allowed!