Preamble
I’m not sure I like “stats.lfs.net” because it’s more than stats. Also I’m not sure I like world.lfs.net that seems a bit vague or lfsworld.lfs.net which has a double “lfs” in it. It’s just wrong somehow. So the hostname is not written in stone and could change if a better name is found.

Style
This site holds a lot of information. Mountains of racer and races data can be searched for, search hosts, upload skins, etc. This is an action site. “Stuff will be done here”. I mean in the sense that people don’t visit this to read articles, but visit it to find things out. They’ll click a lot.
In that sense, the style should make it easy for people to navigate. It shouldn’t take people long to find what they need. Clarity is a word that comes to mind. Not many distractions. The focus is on you wanting something and the site displaying it quickly and clearly without much fuss.

Of course there should be some elements that are shared with the other sites. I’m not sure about what elements - it could be colours, or certain layout choices. That’s the part I’m not very good at. In any case, I’m aiming again at the commonalities that all lfs sites should have to be recognizable as lfs sites.

Pages / Elements
-Home (lfs-world overview)
-Online stats
-Online races
-Online hosts
-Hotlaps
-Some Charts
-Skins
-LFS Racers
-Live alert
-Messages
-Settings

External pages?
-LFS Remote
-Hotlap analyzer
-World Activity map

I want to drop the chat option. It isn’t very useful.

I think the idea of how Apple and Android layout their email software could be a great idea for stats.lfs. Or maybe a similar style to Windows 8 Metro menu. I say this because LFSworld went with the desktop scheme of things, I think sticking to some sort of UI is best option for organisation.

Ofcourse, much better designed than below, and the features that could be added to these can go on and on.

I'm not sure a metro theme would be the best option. In my opinion, metro is too new of an option to go fully with. I do like your first render though.

Metro also wastes space. Metro isn't a good design for the web, it's just not right when it comes down to actual look and feel. It's a designers wet dream, but for websites it's not really practical I feel.

It should have some awesome infographics here and there to geek over I say.