psst https://github.com/ar-nelson/ludwig
If you want to take a look at the code, it's up on GitHub now. But this isn't the MVP, it's not ready to use yet. Maybe in a week? At least that's what I'm hoping.
The MVP should be a fully-functional local forum but won't support federation yet, that's the next step. Luckily Lemmy's federation approach is much simpler than Mastodon's.