https://www.youtube.com/watch?v=kTrOg19gzP4 seriously, seriously did my head in. I was certainly fascinated by this, but I fear that I'd contribute one character, accidentally put it in the wrong place, break the build for two days because nobody can figure out what broke, and then feel really bad for weeks afterwards.
(Okay, okay, diffing... but still. I'd break my own build, at least.)
I _am_ genuinely interested, and I'd LOVE to play with this, but I'm really, really conservative, and would far prefer to be a fly on the wall for a bit for a while first.