A mommy, wife and friend…a survior of child sexual abuse

I really want everyone’s honest thoughts on this please.  The hubby and I have a three bedroom house, average size, and he has an office.  One day we hope to close in the back porch to make it a play room for the kids; but that will cost a few thousand dollars.  I need your help with this.  My oldest son has his own room currently, decked out to the hill with Winnie the Pooh; while my step daughter has her own room.  While right now the baby will stay in my hubby and my room he will eventually get moved to the crib and another room.  My step daughter has only been over to our house for one night since the baby has been born; baby is 8 weeks today.  All choices of her own not to come over.  We have a set of bunk beds where she sleeps on the top and the bottom bunk is the bed in my older sons room he sleeps on (when he sleeps there).  I’ve expressed to the hubby that that room is wasted space and is hardly used.  I would like to make it the older sons room (and deck it out with Lightening McQueen or Transformers) while the baby will move into the Winnie the Pooh room aka nursery.  While I understand my hubby’s concern with his daughter not having her own room, I feel as the boys get older it will be more unfair for each of them not to have their own room while one is empty.  By all means we will never take away a place for her to sleep, her clothes and her toys, books, and games she has at our place.  Oh can’t forget her impressive collection of Bratz Dolls!  I want to be understanding of my hubby’s concerns but at the same time I feel I have to look out for my sons first.  They live here 24/7 365 days a year.  Not every other weekend, or when they choose.  What should we do?  Oh yeah, buying a four bedroom house is not an option at this time.  DAMN!