I kind of have exactly what I wanted, so I'll leave it to the modelling part for later. Now I will do something similar with other parts of my little island. Market, docks and random houses. Of course I was taking examples from books and internet which helped me to define a very believable architectural style. I will also have to add a lot of detail to church windows - something like stained glass to make it much more characteristic and maybe the top view too. I should also use more of those church bell tower concepts around the place, because those are looking just great. I'm still leaving the mapping of things for the last part.