The displacement of a Nimitz-class carrier is around 100,000 tons; if it's entirely made of steel, that comes out to around 11,000 cubic meters, or a 22m cube.

So, it seems like we would be a bit short of the amount of metal needed to make one of them if we wanted it made entirely of gold. But the right order of magnitude.

Of course, smaller ships are of far lower displacements, so we could make several of them.