Here is my super rough starting estimate. 1000 tons to LEO for the total program. At SpaceX costs of $10,000/Kg that would be $10 billion for launch services. Let's say $10 billion for fabrication and $10 billion for ground facilities and $30 billion for salaries. So we have a total of $60 billion over a ten year program. A real bargain compared to $20,000 billion to save the owners of banks.