I worked my way through grad school with a 17 inch macbook pro. I would work in between classes by sitting in a chair in the lounge, putting the laptop on my lap and working. The height of the arms of this one chair was perfectly level with the top of the laptop. The angle of the chair back put the screen straight ahead in my vision. The ergonomics were almost as good as working at a desk.

Ikea doesn't sell that chair anymore and apple doesn't sell that laptop anymore. sigh