I have finished writing instructions for deploying lemmyBB on a production server, which you can follow at the link above. Right now the project is still in a very early stage, nevertheless main funcionality is already working. This includes browsing communities, posts and comments, writing posts/comments and registration/login. Before developing the project further, I would like to get some feedback from users and admins.
If you are interested, you can follow the instructions to install lemmyBB on your own server. This setup also installs lemmy-ui, in order to access functionality which is not yet available in lemmyBB (particularly moderation).
You can also try out lemmyBB on a test server with this setup, namely lemmybb.lemmy.ml. It runs lemmy-ui at lemmyui.lemmy.ml, which shows the same data in another format, and the same account login works on both domains. Registrations are currently open, but keep in mind that this instance is only meant for testing, until other instances are created.
If you notice any bugs or want to request new features, please open an issue or comment here.
Another update, i added instructions for running lemmyBB locally. This will let you use it with any existing instance.