Some thoughts of the design of the mock-ups: Design A: Too angular, somewhat retro early 80's look; a bit like the Canon T70. The placement of the thumb wheel seem awkward compared to the other designs. Prism a bit too square; it would have looked better with the prism design of the 645N(II). The "face" of the prism too tall and the round shapes around the lens mount at odds with the overall angular design.
Design B: Ergonomically the most interesting design obviously inspired by the MZ-S. Unfortunately the grooves by the sides of the prism look awful and the face of the prism and the name tag look silly. Design C: Very close to A except prism design. The rounded profile along the sides of the prism again look at odds with the angular design. The face of the prism rather boring and lack character. Overhang unnecessary. SOLUTION: The prism design of C would look better on A minus the overhang. However, a real solution would be a modification of design B: Keep the slanted top panel (excellent for viewing when using the camera on a tripod). Lower the height of the grip somewhat. Instead of a groove that goes from to the grip through the prism, make it straight and slanted like on the MZ-S. Also, design the prism modelled after the MZ-S but minus that cameras overhang - unnecessary because the 645 has no built in flash and the larger size will give the right propotions anyway. This solution could possibly interfer with the three buttons on the left shoulder of the camera, but these might be put on the back of the camera where there should be lots of room or, alternatively, they could make a "shelf" for then by the side of the prism. Such a camera outlined above would have lots of character and also be very ergonomic. All of course in my opinion... BTW The design of the camera can be found here: http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00BVWU Pål