The other part about the golden dome is that this exact concept has been proposed, researched, and canceled no less than 6 times since 1960. It’s never going to work.
For a president insistent on fixed-price contracts, where the provider has to eat unexpected costs, he seems really bad (yet consistently bad) at estimation:
Golden ballroom: $200m —> $1,400m
Golden dome: $175b —> $1,200b
Trump's proposed 'Golden Dome' estimated to cost $1.2 trillion, far more than he initially said