You're off to a nice start Mate.
Objects like AirCraft can use Normals but I don't recall why they do at the moment.
Subs and Ships cause problems with the Caustics controller though.
You get what I call 'Rainbow Bright' effect.
Never checked to see if SH5 also has that with imported SH4 Units.
There's a few tricks to reduce the size of the model but I'll save those for later.