The 4-way switch is a good idea for saving space, but I agree and in fact, I don't think any yard switches would work in my situation. As you point out, the trouble is the window is in the middle of the wall, so however I would do it, I would loose almost half the narrow (just over 9 feet) room anyway. Also, there is no way to turn the corner because a necessary door is on one side, and my wife's needed cabinets are on the other side. Ah, the challenges of building in O gauge in a small house!! 
