What are your heating bills like during the winter? It sounds like you are slowly heating the outdoors through your massive walls and thin roof. Unless really sealed well, the fiberglass roof insulation will not do much of anything when convective currents of air pass right through it. When summer comes, your preheated walls no longer provide the cooling they did before you installed "modern" central heating. They quickly become sun-soaked with heat and pass this heat straight indoors.
In such a dated build, the building science was just not there for the architect(s) to consider. Your main concern, as far as comfort, is figuring out how to regulate indoor temperatures cheaply and easily. IMHO this is going to be a daunting task, since your envelope is only as heat (and cold) resistant as the least insulated part. You will need to play the part of the building scientist to devise a creative way of leveraging your abundance of cool, brackish water to level your indoor temperatures.
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