Just did some more cypherin' and figured a WW2 Fletcher Class destroyer model would be big if you kept the size of the torpedo at
1.5 cm and maintained the scale for the rest of the ship.
Fletcher Class destroyers were 376.5 ft (114.8 m) in length. The model would be
3.28 meters or around 11 feet at 1/35
3.83 meters or around 12.5 feet at 1/30
5.22 meters or around 17 feet at 1/22
.