Thanks Jack,Hi Carl,
It seems that they come in all shapes, in some there is certainly deck space of some sort down there, in others the hole looks like it is low in the bulwarks, perhaps for mooring? I have seen some pics showing portholes over these openings, also have seen them used as a sort of fairlead with a mooring rope running through. Her is a pic of one with sort of both. Hope this is a bit of help. Your doing a great job, looking forward to your continued good work. Jack.
That explanation makes a lot of sense! Thanks again. I appreciate your positive comments on my build. Cheers, Carl