If you have a small bedroom space and want to maximize the use of the internal space of the walk-in closet, then opening the door outwards may be a better choice. If you are pursuing the neatness of the external space and want to enjoy a more private space inside the closet, opening the door inwards is more suitable.

If your budget is limited and you have high requirements for the appearance of the bookcase, building it yourself may be a more economical choice. But if you are willing to pay extra for saving time and effort, buying a ready-made bookcase is more convenient.