Get ceiling fixtures (fans and lights) wired and set up. If youve got ceiling electrical boxes that are only rated for the weight of a light and you think you might want a fan, swapping the box will probably be easier now. Ive got closer to 20cm of insulation and ive made a bit of a mess of it playing around with the ceiling fixtures

That paragraph goes on to say

However, Co-CEO Richard Teng later said the attack involved a more complex process rather than the misuse of a single engineer’s permissions.