STARING EYES! It's unofficially Radiator vol. 3, and the only mod I'll have put out in the last two years. Watch this space as release is pretty imminent, and thanks for reading. We'll see if people hate it or love it.
EDIT: It's out now. Try it out. A typical run-through for me is about 30 minutes long, so that means it'll take the average Portal 2 player about 1-2 hours. If you get stuck on the first chapter, then just skip to the second, it's really not a big deal.