http://img254.imageshack.us/img254/1056/98418325.png
As you can see, parts of the model are see through. In MED it's fine, but when I run it in the engine it is like this. Any fixes?

Z-Sorting...

Your Skin contains an Alphamap, so the Model seems to be Transparent.
Have a look into the GS Wiki (you'll find the Wiki link here in the upper left Corner).
Search for Alpha Test Material, download this and assign the Acion to Your Model.
Or the Other Way, go into MED -> Skin Settings and deselect the 32Bit Texture Flag.
Now the Model must be look okay.

Regards Sebastian

Thanks a ton, it works now.