5 people may use it now, but if a curious internet traveler wanders in and see's a nice wiki that presents the game as it is, they could keep interested in the game and come play or mod. If they can't find anything due to information being scattered about, then they could just as easily go their merry way about the series of tubes.
If anything, the main page should be redone. Perhaps the left side in the green panel, have "player" resources, such as tech trees, unit information, game storyline (which could just as easily be taken from wikipedia or include a link, easy work there), etc. The right side or blue panel, make it a set of "modding" resources, such as how to edit things within the game, links to the mapper, game, mods, etc. And of course on the right, also wiki-related development things.
Just a suggestion on how to present the information in an easy and upfront manner to people who happen upon the site as well as people who disappear and come back. I know I'm still struggling with figuring out tilesets, as I can't seem to extract the native OP2 files, so I can speak from experience here being a community newbie.