Using as a character

[Jet v4.3.5]

Hi, I've been able to import test models of Marcus Fenix and a berserker from GoW and they can be added to the level and function perfectl with the default UT male animations in the skeletal mesh editor, but I don't know how to replace the mesh of the liandri robot with any of the ones I have imported, even though they use the same bones. Also, I have never done anything along these lines before, so take it for granted that I don't know anything about this other than what I have already done.