Making one bedroom into two bedrooms

Tone
by Tone
Our two kids are currently sharing one medium sized bedroom in a loft/attic floor. Both sides of the rooms have tilted roof, where as on one side a small room/closet is built in with enough space for my daughter to have her bed and dresser there. I was thinking of it is possible to split the room in two by putting up a permanent wall. We would have to remove the one centered window and replace it with two new ones and off course adding an extra entry for the hallway.
Now I am wondering if anyone can direct me to others who has done similar. Preferably with pictures. Thanks!
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