> with the (front) window "frame" being smaller than what is being displayed, so as you walk around you see more of the background revealed from the obscured ed

> with the (front) window "frame" being smaller than what is being displayed, so as you walk around you see more of the background revealed from the obscured edges thus making it appear like it's a wide open space Yes! That parallax type effect when you move around a window is very important for realism - I wonder what's the optimal extra size to have hidden?