What survives of the planned HMS Agincourt design

Is there firm evidence for the planned HMS Agincourt design?

There is evidence that the ship was planned and was broadly a modified Queen Elizabeth-class design, but not enough detail to reconstruct the modifications confidently.

Proof that the planned HMS Agincourt existed does not establish its precise arrangement. The surviving description points broadly toward a modified Queen Elizabeth-class battleship. That label establishes the design family but does not reveal which dimensions, weapons, protection, machinery, or layout features were meant to change. The unresolved historical question concerns what the modification actually entailed.