A build log is basically a step by step pictorial with explanation of what you did. As far as order you may want to do it in the order you did it or divide it up into sections(paint,fabricating...) or keep it grouped together for different parts of the case(front panel,interior,hardware...). Make it fun ans easy to understand.
|2. there will be a private room for build log, (I dunno how build log works either, as in random progress update or ?)|