I'm going to see if Mr. Lee wants to pick this one up, because this is close to his expertise, but maybe I'll make just a couple of points.
It's going to depend on the circumstances, and density makes it easier. Mixed use makes it easier because you have different energy loads being required at different times, and you have heat that you can use.
It's not that there's any one set of circumstances where you can't do it at all. There are different circumstances that facilitate it. The sawmill probably provides a pretty good anchor for the kind of thing you want to do, but it depends a little bit on the actual physical configuration of the community.