Hi Guy's,
When you have a topic that has not been posted upon for around 45 days put it in front of a commitee type thing, say 5 people and decide wether it should be deleted, as some old topics would still be informative in a year or so to newbies to the game and would be a shame to delete.
As for the sections, two sections are ideal, if you had more sections & sub-Sections it could get a bit outta hand and it would get a bit more complicated for pc novices.
Just an idea :-/
Mikey