You have gotten some good advice. We had a similar problem with space and the need to separate sisters. We converted a closet under the stairs into a "neat fort" for sleeping. Our daughter was not allowed to be in anyone's room alone. We watched her whenever she was not in her "fort" with the door alarm on.
No one knows your situation like you do and only you know what you are willing to do. Best wishes on your journey. 
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"It is a great truth and difficult to understand, that the greatest deeds must be done by he, who is content to remain anonymous, lest his action be impeded by too ready acclaim." Anonymous
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