Here's the partially reworked cabin.  The bomb rack, several of which could be carried, was lifted to a set of rails on the cabin wall.  The bomb bay cover was removed and a crewman, instructed by the bombardier who was looking through a rudimentary sight in the floor on the other side of the cabin, pushed the rack over the bomb bay opening.  A mechanism in the rack automatically released the bombs.  When the rack was empty it would be replaced with another.

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