Best I can do at the moment is provide an example of how my own message board system is laid out. It's largely inspired by the iframe-driven UI of 5ch and Futaba, where the left-side panel is for navigating boards, except I've done it with divs instead on every page as a sort of template. Likewise, the top menu holds always available options, like going back to the homepage by clicking the logo image, registration, login, and changing the UI language. The rest of the screen estate is taken up by the currently opened page's content.