...and then starting up the game, trotting off to Riverrun, and seeing that ridiculously huge tower and knowing Hey, I put that thing there.

Interesting. Might have to think up a mod myself. I'm amazed at the amount of manipulation it takes to place large objects like building components and the like. I can imagine it might be a bit clumsy making sure separate components line up properly with each other.

the official Bethesda ones for level design are great. If suggest watching the whole 10 video series.