Unforgettable inspiration. Thinking 1/700.
Start by checking plastic ware for kitchen and for home cleaning. Motor oil drain pans. Craft stores could have useful items. Bow from 1/200-400 ship.
Be slow. 20 kts an accomplishment. Nuclear power for good range and speed.
Obviously IJN. Could build with German, Royal Navy, USN features. Turrets, superstructures and such....