I think there's no need to copy it 1 to 1; the main thing is to understand how to preserve the functionality, i.e.
- Proper page layout: poster data (nickname, avatar, etc.) on the left, the message content on the right, navigation at the top, and a field for writing a new post at the bottom. No half-screen backgrounds or other visual clutter. Posts should follow one after another without staggered indents.
- A proper editor with preview and a minimum set of features, but with full support for HTML tables and BB code (this is primarily needed by the GM for writing visually appealing and easy-to-read posts).
- A control panel through which you can view current topics and their impact on reputation (it won't be superfluous, although the "downvote" button can be left unimplemented — there's no point to it).
- The ability to open posts in a separate window and link to them.
Maybe someone else will recall something else.