Jim, I've never held a "regular" LF camera in my hands, I think I'll have to find and study some pictures.. Thank you for pointing out those sites.
Chris, I think the point-and-guess might be a nice challenge - I imagine it like a "lottery" similar to "hip-shooting" I am trying from time to time with my old barnack rangefinder.
Thank you Jon for the pictures, they might prove very helpful! I've been thinking about something very similar. (And I hope that I'll also manage to take such a nice image as yours).