If you place the bathroom in the location of the airspace, then you won't even be able to properly plan a shower in that bathroom. There is a sloping roof there, which is why the airspace there is also pointless.
that is not the answer to the question. the question was how much you can afford. the cabin is very huge and will probably be quite expensive... what good is it to you if you get an offer but can't even remotely afford it therefore the question here from kaho
At Rolls Royce one would say "enough plus 50 percent" I suppose I'm right in guessing that you wanted to say in a disguised way that the eyes are bigger than the mouth?