Ok, I looked into it a bit, and it's actually fairly easy.
You'll have to follow the stuff the e3 campaign demo does: Create a battlemap, put it into imperial_campaigns/custom_tiles then create imperial_campaigns/custom_tiles_db.txt (copy that from the e3 campaign) and edit it to show the right province and tiles.
The problem I have right now is that when saving a battle in the battle editor and reloading it, at least the height information seems to be lost... It works fine in game, but the editor doesn't show it.
Edit: Hmm the heights seem to work fine now. Weird
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