The twin deck guns is an upgreade that becomes available very late on in the war. Just find the upgrades config bit and change its availability date, and the dual guns should appear in the upgrades section. Theres several posts of how to do this a few weeks back, somewhere around the beginning of april.
With regards to not getting hit by the BS's at 100m, thats partly historically accurate. Certainly the main guns wouldnt be able to depress that low, probably the secondary batteries couldnt either... The only thing that might have been able to hit you that close is the AA weapons. Bear in mind that the BS's have quite high sides, and the main and secondary batteries wouldnt have had a negative depression angle, they are designed to hit things a long way away, not 100m :P
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