Burj Khalifa

i have a prestation and i want to write the setbacks and resolution and i have some points and ides for you to write

1- Generator ( being 4 tons too heavy that was expected ).

2- The glass panels were 18 months behind.

3- The spire ( the very top building ) was too heavy and long to move to the top already built. Cranes were not tall enough and helicopters were not strong enough to take it the too while. So they had to take it up piece by piece.