All projects like this are underbudgeted and for several reasons.
The pressure to get the deals inked drives budgets and estimates DOWN into ghastly, but manageable, ideas of conceptual plans to create the illusion of commitment. They have to start somewhere that they can point to facts and data to support. But, since it has never been done, who is to say their data is wrong. The deal is made, money is paid, loans are locked in and the ball starts rolling down hill. The big money knows the key is to get the investors pregnant. Once they are far enough along, they can’t afford to stop. So the battle to survive the deal long enough to collect a return (any return) starts as soon as a shovel hits the ground.
Now and therefore, all things considered, who is paying the bill makes a difference.
Look at the bright side: These structures will beautifully surreal in 50 years after they have been abandoned and desolated by the war that is coming like a freight train at them right now.