It seems that trenches aren't working properly. They line up fine in a straight line, but any attempt to make a T- or L-shaped fortification results in the intersecting trench piece to disappear. I've checked it a couple of dozen different ways nand it always comes out the same...a missing trench piece. I realize they are still testing the game and that Charles has removed "stuff" to decrease the size of the demo, so it may be no biggie. Just pointing it out should BFC not be aware of it.
Edit: Crap, first time trying to post an Imjur image...all I can get it to do is to link them. Should go back to Photobucket I guess.