I would put in more storage than I thought I needed, and have a walk around cutting table at a comfortable height. After developing back problems, I have come to appreciate wall outlets at waist height. It also helps you see at a glance if everything is unplugged! A comfortable chair to sit and think (facing your design wall!) and maybe another chair for a friend (two or four legged) to sit in while you sew!
Don't forget to post pics!