How to get the Scouts of Tolbrynd balloons for the Level Editor

I'm designing a PVP competitive level whereby each team has air units the other side is trying to shoot down with ground-based AAA units...
It'd be really nice if I had access to those balloons so I could make my plans come too life!
Does anybody know if I can put the level into Notepad or something and edit one of the block ID's?