EDIT: I've got enough early reviewers, thanks!
I'm 50,000 words in, but I suspect I'll need to cut/re-write about half of them in addition to writing another 20k or 30k to get the core stuff complete. Whoever signs up for this, you're signing up for going through some very rough stuff.
Why do it? You'll get max-honest writing (I tend to remove things that could be misconstrued or arguments that the emotional impact would outstrip the benefits to thinking for final versions; you'd get to see the raw stuff), you'll be able to shape a work that thousands of people are going to read, and we'll be in touch to swap ideas/thoughts.
I don't need any proofreading or grammar yet -- the questions are very high level / structural / what's clear and what isn't / what's persuasive and what isn't. So it's not painstaking editing so much as noting when things are clear and when they're not.
Email is: sebastian at sebastianmarshall.com
Also, if you ever played Nethack, Tales of Maj'eyal, or similarly difficult game in the roguelike genre, definitely email me.
In the meantime, if you haven't read Gateless yet -- go get it. Keep getting the most amazing reviews via email and on Amazon. I'm very proud of what we were able to do with it, and it seems people are greatly enjoying it.