Hey, that's very cool.
I'm wondering: How did you do the "corners" if the selected unit?
Are they just another model? Looks like it... but then how do you set it to be exactly the size your selected object? Or don't you?

An ingame editor's pretty cool. Does that mean you'll have a map editor in the game? but then what are you going to do with roads? they'll be hard to put in in an ingame editor...?

keep it up!
Micha