Quote - What troubles me the most is the smoothing artifacts I continue to get on the flat uper floor surfaces; those polys are all split, from each other and from the gray vertical surfaces, but I keep seeing smoothing artifacts along the edges between some of the polys, and where they meet the corner of the gray facets. Yeah, it's driving me a little nuts ;-).

That's a big confusing thing about Poser and seems to have been a "user friendliness" design choice.  The documentation mixes the concepts of polygon smoothing, and phong shading.  They are not particularly related at all.  I don't mean to sound pedantic about this, but the distinction is very important, and the docs leave it extremely muddy.

I think your particular model is the kind of complexity where breaking edges and disconnecting faces may be more trouble than just adding some edges to kill these wonky phong blemishes, which are not your fault, they only appear in Poser.

My Freebies