Estimating casualties from Hood's first hit

How many men were probably killed by the hit forward of HMS Hood's mainmast before the magazine explosion?

Probably somewhere between a dozen and three dozen, with a middle estimate most plausible because penetration and occupancy are uncertain.

The question concerns the hit received before Hood's magazine explosion rather than the catastrophic final event. Estimates range from about twelve to thirty-six casualties. A figure near the middle is considered most plausible because the affected area should not have been heavily occupied. The uncertainty turns on how far the shell penetrated and which compartments its effects reached.