Looking at the picture, i think that there could be enough room for an upstairs area, this you can see because you have a larger yellow bit of wall that is taller, and could fit another bedroom up there! going through one of the orange doors could lead to an upstairs bit, this is were you would normally have like a HND, but maybe they have installed an upstairs instead?
maybe....
What do you guys think?
http://www.thisisbigbrother.com/gall...960&fullsize=1