Snekker to make bokhylle in loft

Hi. i would like a white book shelf made to fit the sloping ceiling in my loft. This means the book shelf will have a triangle-like shape with approximate dimensions of height 110cm to 180cm, width 150cm, depth 40cm. The book shelf will not be fixed to the wall but must be able to be moved. It will act as a room divider located in between the windows (see attached photo). Thanks.