No premade buildings, either. :(
I decided to try something simple by making a remake of my old Halo 4 map Space Out (basically a symmetrical version of Lockout) and there aren't any building structures. In fact, every existing structure from the last three versions of Forge just don't exist anymore. Instead of making Forging easier and more flexible, the fact that entire buildings have be assembled from multiple pieces combined with the new controls make Forging a more arduous task. While I appreciate the expanded tool set, this new Forge is not making a good first impression.