Eric, mesh is not a problem to export using various tools like nifscope and others. There are some plugins for Blender. Many good tutorials out for this on you tube. As long as you are not changing the skeleton you should not have a problem. Also open edges which have to line up n so on. 

You can make custom armor n clothing. You can change the weight mapping in max or blender without too much hassle. Custom skeletons, behavior files and animations are a bear because of hard coded limitations. I had hoped to use Poser, but it has become apparent that it is monumentally to difficult to get Poser joints n weight maps into Max or Blender. The main problem as I understand it is we dont have python access to the inner working of Poser joints.

For a Serana look alike, in the CK under template data you can check use traits for serana and that will give you the body n face of serana. You can change it to taste from there. You have to load Dawngaurd along with Skyrim esm. This is for PC versions. Would love to see your custom face though, alot more fun to do it from scratch that way. If you get the PC version you will have to make sure you slect your custom actor in the CK and Ctrl+F4 and save the face gen data so you dont get a grey face.

Cheers

Mike.

. 

A HOMELAND FOR POSER FINALLY