Hi Late answer but still. I thought about that for long time. I think for ships with slit superstructure GT is not all to mesure ship size. I think Oasis class ships is not like 225-235 k GT, but more like 250 k it terms of size. 250 k for fist two generations and 260 k for third generation. Those ships have stlit superstructure and sperstructure ontinues overboard. But inside areas like Central Park and Boardwalk could easily be counted in GT. (They could even make glass roof over Central Park and glass roof above Boardwalk and glass wall on the back of Boardwalk and those areas will be counted to GT. For Icon of the Seas that would be like 270 GT. Also MSC World Europa also have open promenade, but it's superstructure doesn't go overoard. That means MSC World Europa will be 225 k GT. BUt now one more interesting moment. Oasis have 225 k GT Europa 215 k GT, almost the same. But if two ships will be near each other, Oasis will look like bigger, because it is wider above waterline. So yes, GT dosn't show all size of ship when we talk about ships with split superstructure. Hope you and anyone who will read this message will understand what I mean.