With regard to using Phase One backs on cameras with movements (technical cameras, view cameras...) one should consider the differences between those backs whose sensors have micro-lenses and those which don't. The Phase P45+ and P25+ (and the same non-plus models) do not have micro-lenses so that one won't be burdened by color shift when shooting using movements. The P30+ has the micro-lenses, so would require shooting an opal glass frame with each exposure so that shift could be removed in post. Others certainly know more about the specifics here, but I mention this as a heads-up. I'm looking forward to shooting my P1 back on a technical camera at some point, so chose one without micro-lenses.
I don't know if the Hasselblad sensor employs mirco-lenses or not, but it would be useful to know if considering a back for use in that way.