PS--If you're wondering what a MF rangefinder camera with vertical film travel would look like, here's a page on the 6x7 Linhof 220 (which has both vertical film travel and vertical image orientation, since it's 6x7, but if you imagine it as a 645 camera, it would have horizontal image orientation)--

http://www.marriottworld.com/stock_p.../linhof220.htm

The design, which resembles a 1960s broadcast microphone, never really caught on.