Right now I am trying to build a custom creature that looks like a Frost Atronach, Sounds like a Frost Atronach, but fights like a Giant. I'm hoping a gamesas employee can enlighten me on this subject, because it seems like something most modders haven't really concerned themselves with.

First off, is this possible, or is there some insurmountable problem that makes it difficult beyond feasability?
And Second, how would one go about this?

Here's what I've tried so far, and what's happened. Stop reading now if you're not interested.
I tried going into the GiantRace, making a new one called GiantAtronachRace. Then I simply reskinned him as an Atronach. This thing showed up, fought like a giant, but was invisible.
Then I tried the opposite method. I made a giant Frost Atronach, and replaced combat style (in the AI Data tab) with csGiant and changed Override from Behavior Graph to GiantRace. This thing showed up looking like an impressive Frost Atronach, but runs away like a sissy girl and won't fight.

Are there other things I have to do to get this working?