Thanks to all who have posted. This is all very helpful.
What I did with my SQ-A, since I can't seem to get my poorly designed manfrotto head to tilt more than 90 deg, is mount the tripod on the ceiling (or use a crane if shooting outdoors) and compose while laying on the floor on my back (a pillow is handy). Then, for printing, I took an angle grinder and a jack to my 6x6 neg carrier so I could rotate it 45 deg for printing. After getting the print mounted and hung (using a mirror, of course), I then have people view while laying on their side using the same aforementioned pillow and bingo! it looks great!