Great room! I have angled ceilings upstairs but only one of the two rooms has used one one of the knee walls for space. I just think that is the best name for them, knee walls. I have never seen that before. Of the two rooms upstairs the smallest is my bedroom and the largest my sitting room. It is the house I grew up in and my parents are still here. I am in the process of making the small room a sewing room. Moving big things from one room to another is a challenge. I do a little at a timel. Would love to have a room like yours! I hope you spend many happy hours there!