Here's my thoughts on Codex: Eldar-Online...
Colour Scheme: Space Wolves Grey (?) and White (wonder where I got that from...
).
Army List: Army split into two types, the Good Guys (use Craftworld Eldar) and Bad Guys (Dark Eldar). Harlequins are in both. Use the Star system for unit types. Basic troops are *, Aspect Warriors/Warlocks/Wyches/Incubi/Veteran Sergeants or equivalent are **, Exarchs, Wych Sergeants/Incubi Sergeants, etc are ***, 2-Wound HQs are ****, 3-Wound HQs are *****.
That's just my vague ramblings. I'll leave the common sense to someone with more of it to spare (If I had my way, you could take IG & Tau in Good Guys, and Orks in Bad Guys. I can't see Eldar of any type working with Chaos, 'Nids don't ally, and
No-one would ever work with Necrons; they're as bad as 'Nids!).