correct me if im wrong, but arent the cielings and rooms part of the sbsp, which as far as we know on xbox, is not editable making it impossible for you to add ceilings and rooms, unless you use the same idea that xorange did in his structures mod and made rooms outa the walls. The only prob with that is they will all be the same texture and you will have the inevitable flaws that xorange had, gaps overlaping, SparkEdit is a great tool dont get me wrong, but to the best of my knowledge it wont do the things you want, sorry.