Just tried approaching this a different way ( http://www.renderosity.com/mod/forumpro/?thread_id=2886725&page_number=1#msg4184473 ) and the Z offset value I'm getting ties up with the 1.1PNU value that Les Bentley gave earlier in this thread. Re-reading Les' post and my response to it makes me think I'd brainwashed myself! Sorry Les, I think you were right!  :)

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident. And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU or something else.
*soon only to be available in two flavours -  DAZ and Renderosity