I made an 8 inch lemon drizzle cake with lemon buttercream and carved the middle out. I covered the well with grey icing and put some blue icing inside for the water. It took two hours to make the roof by laying sugar tiles carefully on some iced cardboard. I constructed pillars out of doweling and sugar and stuck the roof to it. The roof was quite heavy so I supported the structure with sponges whilst it dried. I made a bucket and tied it to some rope and placed it inside to finish it off.