On the monthly releases, IMO don't worry about it. Most of the good games here aren't on monthly schedules they're on "whenever its done" schedules. Releasing incomplete builds probably isn't the best idea, they'll get leaked and since people here don't know how to read it'll lead to a bunch of whining.
Thank you for your advices.I agree with jamdan, don't pigeonhole yourself into a set release schedule if your workload doesn't allow for it, all you'll do is annoy people.
A completion % update post every week or 2 might be your best bet, just so people know you're still working on it, and then release it when the build is ready.
Whatever you decide, I'd suggest proper "transparency" when it comes to issues or delays or whatever. If you fall down the stairs and break your arms, people will understand as long as you have a good track record. If you try telling your patrons that your mother died for the 3rd time...not so much (and yes, I've actually seen that).
I was a little stressed by this question and the responses I'm getting are very reassuring.