Now waiting for Sean to show us his mockup of a SX-70-style Holgaroid with a pack film holder on the bottom.
Speaking of which, how does Polaroid do it? Pentaprism for the image path to the film? I guess I never really thought about how they orient the image 90° from the lens without flipping it horizontally.
Duh, lens flips the image once, simple mirror flips it again. I blame lack of caffeine this morning, but you may have different suspicions.
I found references to Polaroid having designed but not produced a pack film SLR but no images or sketches yet on my hunt.