@strats all said:
Due to the urgent nature of some of the repairs I think the way to go is to document everything, have the repairs done now by the body corporate and then pursue costs.
Sounds like a plan. I think it has been established in law that, in the event of a delay, the Owners Corps’ first priority is to effect repairs then find the person responsible for the damage and get them to pay for it (rather than the other way round).