Don't know if u used Clipboard anything before, I now u mentioned it. But the good thing about clipboard is that you can snap it and it will build everything from that location. I use it for walls and small special rooms. And afterwards it's correctly snaps to the rest of your stuff. Ex: I have 6 types of walls I usually build. I just keep pasting my walls from clipboard and they will end up in the exact position from the "copytool" as when I took the snap/blueprint/copy. So I just connect 3 of the same copys and get a long wall with perfect alignment.