Would building the 31-inch-gun ship from pykrete make it more useful?
Short answerProbably not: pykrete is judged tough but brittle, and protection would depend largely on the vessel's enormous mass.
NotesPykrete does not remove the objections to the earlier super-battleship proposal. It is described as hard and tough but brittle. A sufficiently massive hull could still absorb punishment through its sheer size, which is compared with turning an asteroid into a battleship.