Try to figure out where you are putting your bookcases, your design wall, and what you really see when you walk in.
Do you want roll up blinds on the windows or curtains? If you have a wall that you do not see from the walk/in door, try to picture your bookcases there, that way you will not see them from the door. I tend to want my actual sewing table towards the middle of the room so you have ample room behind it for an additional table, to carry the bulk of the quilt or whatever you are working on. I would love a U-shaped one. More to think about!