Building a warship is a process that takes years, not like making a new Toyota.
Your point being?
$4 billion for one small ship is an outrageous price. For another $9 billion I'd rather have another aircraft carrier. It's more flexible and would carry a heckuva lot more firepower.
In a Trump presidency, warships will get built better at much lower cost. All it takes is some American ingenuity. The Zumwalt ship sounds like it was designed by globalist and the Cheap Labor Express.
I'm no expert, but the Zumwalt is sounding like an Edsel.