They're calling this thing a corvette. It has the displacement of a WWII destroyer. Today's Arleigh Burke class destroyers have the displacement of a WWII light cruiser (8000-10000 tons). Tomorrow's Zumwalt class destroyers have the displacement of a WWII heavy cruiser. There has been some serious hull inflation going on ... comparing armament isn't as simple as comparing bore diameter.
Well if you think a 57 mm can do what a broadside of 5 t inch shells can do, we'll have to disagree.
As for hull size, private rooms for the women sailors takes up space. And you can't free up enough space by removing the armor.
Today's Arleigh Burke class destroyers have the displacement of a WWII light cruiser (8000-10000 tons).
That's about the range of a pre-dreadnaught battleship.