I was playing around with Ivy Generator the other night and found that sometimes I had to flip normals and other times didn't... It really was a sort of hit and miss process, requiring a lot of tweaking. Another issue I discovered was that the diffuse image map imported properly into Poser with the model but without the trans maps, this being very problematic if flipping normals or U/V texture coordinates as the trans maps need to be flipped to match the diffuse. Very confusing, and most easily remedied with an image editor, or perhaps can be done nodally within the material room itself. Yet another thing to look into. I would say that giving the exported object some going over in a modeler and perhaps UVMapper before use in Poser would be a good course of action.

Anyway, Ivy generator certainly is a clever, useful little app if one has the patience to iron out the idiosyncrasies in relation to Poser. I'd love to experiment further and offer more input but all of my spare time is absorbed by a project at the moment. That being said, I must admit that if I were attempting to create the kind of figure that you have conceived I would probably go a different route, as I feel that Ivy Generator's results are best reserved for static object creation. Your perseverance and progress thus far is admirable, I can see it being a hair-pulling experience.

Good luck, and keep us posted on your progress. :)