Is there a way to move the buildings once built?
Heck, even destroying and rebuilding would be an option at this point.
There is no way to move buildings once they've been built, but there is a way to move them. Open your build menu (hit e) and press either the delete key (don't hit backspace) on pc or fn+backspace on mac.
Any building that have been deleted are saved and are built instantly the next time you place its blueprint down.
Hit r to rotate blueprints.