Download the campaign map zip, avalible in the resource section. There you can look at the levels in the game and see how we made it.
I'm just gonna slip it in here, but myran is also working on a prefab system that will make it much easier to make predefined entity nodes and copy around your level and share scripts and such, at the moment it's only works as an island w/o external connections to the rest of the level, but I hope he will sort that out too.