In a shipwreck with mast, in front of the doorway at the back of the ship, there are some slabs at the ceiling that make it harder to get in, because you will have to crouch. Also, due to it being a bottom half slab, there is a gap that really looks out op place. The staircase at the outside also doesn't work with the slabs. I think it would make more sense if the slabs were the top half.