You've got me on the edge of my seat, I#6. Looking forward to hearing more when you get the chance.
Another famous coastal artillery site in that general region:
Fort Siloso — The Sole Restored Coastal Artillery Battery from ‘Fortress Singapore’.
An interesting anecdote regarding the British gunners from Singapore. As recounted in Ian Denys-Peek's
One Fourteenth of an Elephant (pp76-77) when removing a large boulder from the path of the soon to be railway line. A tunnel is dug under the boulder and is packed with explosives:
Half a minute passes, there is a dull whump and dust rises as though from a beaten carpet. For a slit second nothing more happens. Then there is a great roar, and an enormous quantity of gravel is ejected at high speed from the tunnel, travelling across the river in a flat trajectory. In another split second, all 500 of us are dashing smartly to our right as the hail of earth and stones (looking much like a comet's tail) smashes squarely into the [Jap's] hut.
The tunnel shaft had become the barrel of a giant cannon, the solid hillside behind the stacked dynamite and the mass of the boulder on top had confined the wholeof the explosion's force along the shaft, and the packed gravel had been hurled out like grapeshot from an old-fashioned naval gun. The boulder continues to sit there impassively, astride a blackened and smoking trench.
...It doesn't seem to occur to [the Japanese] to blame us...How were they to know that our men doing the tunnelling were gunners from the heavy coastal artillery regiments which manned Singapore's fifteen-inch guns? Knowing exactly what the effect of the explosion would be, the alignment of the tunnel had been most carefully aimed to find a satisfying target, and the men's scarred faces wear grins of quiet pride in their achievement.