The ready service lockers are not well described on the blue prints included with the Dumas kit.  From them you can only build the generic shape of the locker.  They lack allot of the details found on the real lockers.

I made my lockers from 0.040 styrene.  I made the handles from 0.030 brass and painted them haze gray. 

These are the 3"/50 ready service lockers under construction.  They have clam shell doors with three hinges. 

The finished 3"/50 ready service locker mounted on the deck.  The ready service lockers were not flush mounted to the deck.   The were mounted on legs, about 4" off the deck.  Here, you can see where I had the add styrene stock to ensure that the lockers were mounted level on the deck.

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Here is one of the .50 cal ready service locker just before I mounted it to the deck.  These lockers are mounted on both port and starboard sides on  01 level by the turbine air intake.  Again, note the legs on the locker.

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Here is one of the .50 cal ready service locker mounted on the deck. 

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This is the offensive grenade ready service locker.

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These ready service lockers all have white tops.  Actually, the white top is another piece of metal mounted to the tops of the lockers.  This is to reduce the heat signature of the the lockers to reduce being hit by munitions that use IR seekers.  The tops can be clearly seen in the following pictures.

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(Click on image to enlarge)