OK, let's make this easy.  If you have your parts where you want them in Wings, you can bring them into Poser (individually) in the proper place.  When importing, disable figure scaling, and don't center anything.  Once you have each part in, all you have to do is set each parts' axis in the joint editor, and also make sure each piece has the correct parent in the hierarchy.  It might not be commercial quality, but for your own use it should be just fine.  Set joint limits in the joint editor if you need to restrict movement.