Well considering how the models are structured this might not be too bad.
However be sure the parts are scaled to the identical size as the original.
Here are some 'issues'
Detailed hand cannot have animation for the fingers. (no finger bones

) So they will be static.
Models will not deform etc in an organic manner. It's because the engine uses individual models for each 'bone' and they are stuck together like a DOLL would be

You will need to model arm and leg parts hands feet torso waist head and weapons as seperate models and glue them together in almost identical proportions. This will prevent the animation data from being incorrect (basically).
The field models have the same number of bones as the battle models (surprised?)
All I can think of off the top of my head.
Cyb